M15

[Farandar]

Some interesting stuff in that core set...

In Garruk's Wake    7BB

Sorcery

Destroy all creatures you don't control and all planeswalkers you don't control.

Sorcery speed but nice wrath effect. It's a 9 ccm, so you can fetch it with Grozoth.

Ob Nixilis, Unshackled 4BB

Legendary Creature - Demon

Flying, trample

Whenever an opponent searches his or her library, that player sacrifices a creature and loses 10 life.

Whenever another creature dies, put at +1/+1 counter on Ob Nixilis, Unshackled.

Weak body with decent combat abilities, but a huge utility power... worth testing imho.

Flesh to Dust 3BB

Instant

Destroy target creature. It can't be regenerated.

Vanilla removal. How bad can that be ?

I haven't seen anything else worth attention yet. Have you ?

[psly4mne]

Soul of Innistrad   4BB
Creature - Avatar
Deathtouch
3BB: Return up to three target creature cards from your graveyard to your hand.
3BB, Exile Soul of Innistrad from your graveyard: Return up to three target creature cards from your graveyard to your hand.
6/6


Soul of New Phyrexia    6
Artifact Creature - Avatar
Trample
5: Permanents you control gain indestructible until end of turn.
5, Exile Soul of New Phyrexia from your graveyard: Permanents you control gain indestructible until end of turn.
6/6

Powerful ways to refill your hand or protect your permanents that work to an extent from the graveyard. The other Souls are broken, but these are pretty interesting.

Avacyn, Guardian Angel   2WWW
Legendary Creature - Angel
Flying, vigilance
1W: Prevent all damage that would be dealt to another target creature this turn by sources of the color of your choice.
5WW: Prevent all damage that would be dealt to target player this turn by sources of the color of your choice.
5/4

Fatty that protects you and your other creatures from damage. Boring, but probably decent.

Mercurial Pretender 4U
Creature - Shapeshifter
You may have Mercurial Pretender enter the battlefield as a copy of any creature you control except it gains "2UU: Return this creature to its owner's hand."

Yet another Clone with a nice upside. Better than Sakashima, if you're playing him.

Genesis Hydra    XGG
Creature - Plant Hydra
When you cast Genesis Hydra, reveal the top X cards of your library. You may put a nonland permanent card with converted mana cost X or less from among them onto the battlefield. Then shuffle the rest into your library.
Genesis Hydra enters the battlefield with X +1/+1 counters on it.

The arbitrarily large non-evasive creature is probably not a huge deal, but the uncounterable battlefield tutor is the interesting part. Probably too broken, but could fit in for some people.