Hekaw, The Monster

When Hekaw, The Monster enters the battlefield,
you may search in the library for up to three basic lands, put these onto the battlefield tapped. If
you do, shuffle library.
Trample.
Whenever a creature dies, put X +1/+1 counters
on Hekaw, The Monster. Where X is equal to that creature's toughness.
Scientists... They did do this to me...