Jelliva, the Mindless

Haste, Gelatinous
(Creatures with gelatinous can declare attacks on
their controller & attack and black at random each
combat if able. Whenever they receive damage from a source other than themselves, they gain a +1/+1 counter)
{t}{u}: Target creature gains Gelatinous & is a jellyfish in addition to its other creature types.
This ability costs 3 more to target a creature you
don't control