Eternal Witness

When this creature enters, search your library for a Forest card, put that card onto the battlefield, then shuffle.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) When this creature enters, destroy target artifact, enchantment, or land.

Whenever you gain life, target opponent loses that much life. 3BB: Creatures you control gain lifelink until end of turn.

Defender Put a -0/-1 counter on this creature: Add G. Activate only once each turn.

Flying U, Sacrifice this creature: Counter target noncreature spell. Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Flying Whenever you draw a card, Niv-Mizzet deals 1 damage to any target. T: Draw a card.

T: Add CC. Activate only if you control five or more lands.

As an additional cost to cast this spell, sacrifice an artifact or creature. Draw two cards and create a Treasure token. (It's an artifact with "T, Sacrifice this token: Add one mana of any color.")