Astrophel, Cosmic Ruler

Play: Add 1 card from your DP to your hand with
a total cost of 3 or less; You may then play it immediately.
{t}: Destroy any number of friendly creatures in
play; select a "Cosmic" creature in your DP with
cost equal to or lower than the number of
creatures you destroyed by this effect +1 and play
it immediately, readied.