Snakes

, Sacrifice a creature: This artifact deals 1 damage to any target. Whenever a creature enters, you may untap this artifact.

Other Snake creatures you control get +2/+2. Whenever a Snake you control deals combat damage to a player, you may draw a card.

: Choose any number of target creatures. Each of those creatures gains persist until end of turn. (When it 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.)

Whenever another green creature you control enters, put a +1/+1 counter on target creature.

Flash (You may cast this spell any time you could cast an instant.) When this creature enters, choose one — • Untap target permanent you control. • Tap target permanent an opponent controls.