Brachydios

Trample
When Brachydios deals damages to a creature, put
a "Slimeblight" counter on it. This creature gets
"{t} : remove "Slimeblight" counter from this creature.". If a "Slimeblight" counter gets to 3,
remove it. The creature is dealt 5 damages.
Increase every "Slimeblight" counter by one at
every End Phase, except for those which have just
been placed.(Those effects still apply if Brachydios is
taken out from the battlefield.)