Tinand Annan, Merfolk Skulk

Defender. This creature is unblockable.
Whenever you tap a non-land permanent,
if it isn't being declared as an attacker, put a
+1/+1 counter on Tinand Annan, Merfolk Skulk.
Whenever you put a counter on a non-land permanent, this creature may attack as though
it did not have Defender until end of turn.