Another Booster Pack From My Set

[Marco]

Skeletal Warriors
3B
Creature – Skeleton Warrior (Common)
3/1
When Skeletal Warriors enters the battlefield, if its rebirth cost was paid, sacrifice a creature.
B: Regenerate Skeletal Warriors.
Rebirth B (You may cast this card from your graveyard for its rebirth cost. If you do, it enters the battlefield with a death counter on it. If this creature would leave the battlefield, if it has a death counter on it, exile it instead.)

Abnegate
U
Instant (Common)
As an additional cost to cast Abnegate, sacrifice a nonland permanent.
Return target permanent to its owner's hand.

Banish
4W
Sorcery (Common)
Syphon 2 (As you cast this spell, tap up to two untapped lands you don't control. Each land tapped this way reduces this spell's cost by 1 or by one mana of any color that land could produce.)
If you control a Plains, put target creature on top of its owner's library.

Anarchic Satyr
BR
Creature – Satyr (Common)
2/2
T: Target creature gains plainswalk until end of turn.

Repudiate
UU
Instant (Common)
Counter target creature spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Peridot Gemstone
1
Artifact (Common)
Peridot Gemstone enters the battlefield with two charge counters on it.
T, Remove a charge counter from Peridot Gemstone: Add G to your mana pool.

Dwarven Pioneer
3R
Creature – Dwarf Nomad (Common)
2/4
When Dwarven Pioneer enters the battlefield, if W was spent to cast Dwarven Pioneer, you may search your library for a Plains card, put it onto the battlefield tapped, then shuffle your library.

Cripple
B
Instant (Common)
As an additional cost to cast Cripple, sacrifice a nonland permanent.
Target creature gets -4/-4 until end of turn.

Fierce Gull
1U
Creature – Bird (Common)
2/2
Flying
At the beginning of your upkeep, put the top two cards of your library into your graveyard.

Wreck
2G
Sorcery (Common)
Syphon 2 (As you cast this spell, tap up to two untapped lands you don't control. Each land tapped this way reduces this spell's cost by 1 or by one mana of any color that land could produce.)
If you control a Forest, destroy target artifact or enchantment.

Horizon Walker
2WW
Creature – Human Wizard (Uncommon)
2/3
Plainswalk
Whenever Horizon Walker deals damage to a player, you may exile another target permanent. If you do, return that card to the battlefield under its owner's control at the beginning of the next end step.

Goblin Rabble
R
Creature – Goblin Warrior (Uncommon)
1/1
Sacrifice Goblin Rabble: Creatures you control get +1/+0 until end of turn.
Rebirth R (You may cast this card from your graveyard for its rebirth cost. If you do, it enters the battlefield with a death counter on it. If this creature would leave the battlefield, if it has a death counter on it, exile it instead.)

Arcane Initiate
1UU
Creature – Human Wizard (Uncommon)
2/2
T: Counter target spell or activated ability unless its controller pays 1. (Mana abilities can't be targeted.)

Revered Lammasu
4WW
Creature – Lammasu (Mythic Rare)
5/5
Ward against black and against red (This card can't be the target of black or red spells or abilities from black or red sources, even if this card isn't on the battlefield.)
Flying
At the beginning of each player's end step, untap all creatures you control.

Mountain
Basic Land - Mountain
(T: Add R to your mana pool.)

[TheBrassMan]

First pick Revered Lammasu! shit is a bomb

Syphon feels awkward... won't people just tap out every turn with no manaburn?

[Marco]

Yes, your opponent can just tap all their lands at the end of their turn to prevent you from syphoning their mana on your turn (only creature, enchantment, and sorcery cards have syphon), but not if they want to play instants or other reactive spells... Cancel, Holy Day, Vines of Vastwood, etc.

I also have cards in my set that circumvent opponents with tapped lands. For example, the Explorer cycle:

Tireless Explorer
1W
Creature – Human Soldier Scout (Common)
1/1
T, Untap a tapped land an opponent controls: Add one mana of any type that land could produce to your mana pool.
Rebirth 1W (You may cast this card from your graveyard for its rebirth cost. If you do, it enters the battlefield with a death counter on it. When this creature leaves the battlefield, if it had a death counter on it, exile it.)

Ceaseless Explorer
1U
Creature – Merfolk Scout (Common)
1/1
T, Untap a tapped land an opponent controls: Add one mana of any type that land could produce to your mana pool.
Rebirth 1U (You may cast this card from your graveyard for its rebirth cost. If you do, it enters the battlefield with a death counter on it. When this creature leaves the battlefield, if it had a death counter on it, exile it.)

Restless Explorer
1B
Creature – Zombie Scout (Common)
1/1
T, Untap a tapped land an opponent controls: Add one mana of any type that land could produce to your mana pool.
Rebirth 1B (You may cast this card from your graveyard for its rebirth cost. If you do, it enters the battlefield with a death counter on it. When this creature leaves the battlefield, if it had a death counter on it, exile it.)

Reckless Explorer
1R
Creature – Dwarf Scout (Common)
1/1
T, Untap a tapped land an opponent controls: Add one mana of any type that land could produce to your mana pool.
Rebirth 1R (You may cast this card from your graveyard for its rebirth cost. If you do, it enters the battlefield with a death counter on it. When this creature leaves
the battlefield, if it had a death counter on it, exile it.)

Dauntless Explorer
1G
Creature – Elf Druid Scout (Common)
1/1
T, Untap a tapped land an opponent controls: Add one mana of any type that land could produce to your mana pool.
Rebirth 1G (You may cast this card from your graveyard for its rebirth cost. If you do, it enters the battlefield with a death counter on it. When this creature leaves the battlefield, if it had a death counter on it, exile it.)

[AmbivalentDuck]

I don't know how I feel about the "balls to the wall" theme.  Basically, both players should tap as many lands as early as possible to avoid syphon.  The explorers basically just put Utopia Tree in every color with random resilience to removal.  As such, the set strikes me as a Timmy favorite: the players are encouraged to play big, splashy spells as early and often as possible.