Bubbly Foam

Enchant creature, it gains Foam 1 - For each turn
this creature doesn't attack or block, add a +1/+1 counter to it, if it does, remove all +1/+1 counters
from it.
Evasive Armor - As long as this creature has two
or more +1/+1 counters, replace Foam 1 with
Evasive Armor, it is then Unblockable and gains
Shroud. If attacking or blocking, remove all
+1/+1 counters from it.