Slime Elemental

Indestructible, Trample
Creatures and lands you controle are Slime in addition to their other types.
{t} : Absorb a creature you controle. (It is no
longer considered as a creature, it's strength,
toughness and abilities are added to Slime
Elemental's as long as both are on the battelfield.)
At the begining of your upkeep, cancel all effects
that should prevent Slime Elemental from
attacking, make it lose it's abilities or reduce it's
basic strength or toughness.