Avian Spellslasher

Flying

Reverberation {w} (At the beginning of your upkeep,
you may pay this permanent's reverberation cost. If
you don't, sacrifice this permanent.)

At the beginning of your pre-combat main phase,
put a +1/+1 counter on Avian Spellslasher.

When Avian Spellslasher dies, gain life equal to the
number of +1/+1 counters on it.