Yahenni, Undying Partisan

This land enters tapped unless you control a Mountain or a Plains. T: Add R or W.

Target player draws X cards.

Enchant creature you control When this Aura enters, exile target nonland permanent an opponent controls until this Aura leaves the battlefield. Enchanted creature gets +1/+0 and has lifelink and ward 2.

Destroy all creatures that aren't enchanted. They can't be regenerated.

(T: Add W or B.) This land enters tapped. Cycling 2 (2, Discard this card: Draw a card.)

Whenever this creature or another creature you control dies, each opponent loses 1 life and you gain 1 life.

Sacrifice a creature: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Whenever you sacrifice a creature, draw a card. This ability triggers only once each turn. 2, T, Sacrifice another creature: You gain X life and put X +1/+1 counters on target creature you control, where X is the sacrificed creature's power.