Zendikar

Whenever Ondu Cleric or another Ally enters the battlefield under your control, you may gain life equal to the number of Allies you control.

Flying

Flying Whenever Umara Raptor or another Ally enters the battlefield under your control, you may put a +1/+1 counter on Umara Raptor.

Whenever Murasa Pyromancer or another Ally enters the battlefield under your control, you may have Murasa Pyromancer deal damage to target creature...

Kicker {R} (You may pay an additional {R} as you cast this spell.) When Goblin Bushwhacker enters the battlefield, if it was kicked, creatures you ...

Whenever Highland Berserker or another Ally enters the battlefield under your control, you may have Ally creatures you control gain first strike un...

Whenever Hagra Diabolist or another Ally enters the battlefield under your control, you may have target player lose life equal to the number of All...

Bloodghast can't block. Bloodghast has haste as long as an opponent has 10 or less life. Landfall — Whenever a land enters the battlefield under yo...

Whenever Seascape Aerialist or another Ally enters the battlefield under your control, you may have Ally creatures you control gain flying until en...

Whenever an opponent shuffles their library, you may put a +1/+1 counter on Cosi's Trickster.

First strike, vigilance Whenever Kazandu Blademaster or another Ally enters the battlefield under your control, you may put a +1/+1 counter on Kaza...

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

Defender, flying {T}: Put Gomazoa and each creature it's blocking on top of their owners' libraries, then those players shuffle.

Landfall — Whenever a land enters the battlefield under your control, Hedron Scrabbler gets +1/+1 until end of turn.

If Nissa's Chosen would die, put it on the bottom of its owner's library instead.

{R}: Molten Ravager gets +1/+0 until end of turn.

When Goblin Shortcutter enters the battlefield, target creature can't block this turn.

Kicker {R} (You may pay an additional {R} as you cast this spell.) When Goblin Bushwhacker enters the battlefield, if it was kicked, creatures you ...

Trample, haste