Plains

Leonin Vanguard

At the beginning of combat on your turn, if you control three or more creatures, Leonin Vanguard gets +1/+1 until end of turn and you gain 1 life.

Whenever a creature enters the battlefield under your control, you gain 1 life.

Enchant creature
Enchanted creature can't block, and its activated abilities can't be activated.

Target creature gets +2/+2 and gains flying until end of turn. You gain 2 life.

Target creature gets +2/+2 and gains lifelink until end of turn. (Damage dealt by the creature also causes its controller to gain that much life.)

Whenever another creature enters the battlefield under your control, you gain 1 life.

Target creature gets +2/+2 until end of turn.
Addendum — If you cast this spell during your main phase, that creature gains flying until end of turn.

Whenever you gain life, put a +1/+1 counter on Ajani's Pridemate.