Massacre Wurm

Instant and sorcery spells you cast cost 1 less to cast. Whenever you cast an instant or sorcery spell, draw a card.

1B, Sacrifice a creature: You gain 1 life and draw a card.

Whenever this creature attacks, each opponent loses 1 life.

Morbid — When this creature enters, target creature an opponent controls gets -1/-1 until end of turn. If a creature died this turn, that creature gets -13/-13 until end of turn instead.

Landfall — Whenever a land you control enters, equipped creature gets +2/+2 until end of turn. Equip 1 (1: Attach to target creature you control. Equip only as a sorcery.)

2W: Look at the top four cards of your library. You may reveal a creature card with power 2 or less from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Whenever another creature you control enters, put a +1/+1 counter on this creature. As long as this creature has three or more +1/+1 counters on it, it has flying and is a Knight in addition to its other types.

Whenever this creature attacks, each opponent loses 1 life.