What sort of creature or card abilities would you come up with?
Are there any existing abilities that you would simplify such as Unnafected by summoning sickness to Haste or most recently Attacking doesn't cause this creature to tap to Vigilance and the Gang of Elk ability to Bushido.
Here are a few ideas I've been toying with.
Celerity (You may play this creature any time you could play an instant)
Force (Remove a card in your hand from the game of the same color as the spell played, and pay 1 life instead of paying the casting cost) - this could be for creatures or other spells.
Immunity or Invulnerable (this creature can't be the target of spells or abilities.)
Landbond:
Forestbond (when this creature comes into play you may put a basic Forest card from your hand into play.)
It would be the same for the other land types.
Landheart:
Plainsheart: (If an opponent controls a plains, this creature gains +1/+2 and First Strike.)
Swampheart: (If an opponent controls a swamp, this creature gets +2/+1 and Fear.)
Forestheart: (If an opponent controls a Forest this creature gets +1/+1 and

Regenerate this creature.)
Islandheart: (If an opponent controls an Island this creature gains Flying and

{U} : Return this creature to it's owner's hand.)
Mountainheart: (If an opponent controls a Mountain, this creature gains Haste and +1/+0.)
Venom: Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat.
Sedate: When this creature deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap phase.
Repulse: When this creature comes into play return target permanent/land/creature/artifact/etc. to its owner's hand.
Psion:

: (Tap this creature to deal

damage to target creature or player.)
Weakness to {Color}: (This creature can't block {Color} creatures.)
Hesitation: (This creature is affected by summoning sickness for an additional turn.)
Peek:

: (When this creature comes into play look at the top

cards of your library and put them back in any order.)
Essence (Whenever this creature deals or receives combat damage you gain that much life.)
Recover (When this card is put into any graveyard from play, shuffle it into its owner's library.)
Autoresolve (This spell can't be countered, this spell's ability can't be countered. This spell has no resolve period.)
Some of these abilities you can pay to activate, such as Recover, or Peek, etc...
I'm also working on a new version of Banding, but I'm still working the kinks out of it.
Let me know what you think.