Astalos

Flying, Double Strike
At the beginning of your upkeep, you may put a
charge counter on Astalos.
{e}{e}: Astalos gets +2/+0 until end of turn.
Known as the "Thunder Wyvern," Astalos can charge itself with electricity from the furious movements of its
wings, tail and crest. In its charged state, the
membrane in its wings take on a beautiful glow that
only barely offsets the terrible nature of this
monster.