Eater of Worlds

Reach, Trample, Multi-Strike (A card with Multi-Strike attacks a number of times equal to the
number of {p/c} paid with life, and only deals
combat damage after a creature without
M-S). Eater of Worlds Enters the battlefield
with X -1/-1 counters on it. -1/-1 Counters on
Eater of worlds provide +1/+1 instead. When
Eater of Worlds is destroyed, conjure a number
of copies into your hand equal to the -1/-1
counters on it. They all perpetually get -X/-X
where x is the extra mana spent.