Doppio, Comfortable Siren

Bestow {2}
Doorguard — (When an opponent casts a
spell during their main phase, your creatures
gain +1/+1 until the next combat phase begins.)
Doppio, Comfortable Siren gains +1/+0
when an opponent casts their first spell
during their turn.
Enchant creature gains Doorguard and
+1/+1.