Return to Ravnica

Exile target creature, then populate. (Create a token that's a copy of a creature token you control.)

Whenever Crosstown Courier deals combat damage to a player, that player puts that many cards from the top of their library into their graveyard.

Until end of turn, target creature gets +1/+0 and gains first strike and lifelink.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Flying

When Seller of Songbirds enters the battlefield, create a 1/1 white Bird creature token with flying.

Haste

Flying

{5}{G}: Regenerate Selesnya Sentry.

{U/R}: Frostburn Weird gets +1/-1 until end of turn.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) Scavenge {1}{B}{G} ({1}{B}{G}, Exile this card from your gravey...

Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)

Armory Guard has vigilance as long as you control a Gate.

Defender Reach (This creature can block creatures with flying.) {1}{B}{G}: Regenerate Trestle Troll.

Skull Rend deals 2 damage to each opponent. Those players each discard two cards at random.

Flash (You may cast this spell any time you could cast an instant.) Vigilance

Return target creature to its owner's hand. You gain 2 life.

When Centaur Healer enters the battlefield, you gain 3 life.

Put a +1/+1 counter on target creature. Put a +1/+1 counter on target creature.

Create a 3/3 green Centaur creature token, then populate. (Create a token that's a copy of a creature token you control.)

{2}{B}: Stonefare Crocodile gains lifelink until end of turn. (Damage dealt by this creature also causes you to gain that much life.)

Reach (This creature can block creatures with flying.)

Target creature gets +3/+3 until end of turn.