Hannah, Aspiring Snapshot

When Hannah, Aspiring Snapshot attacks, create Hannah's Assistant, a legendary 2/3 green and
red creature token with "Whenever Hannah's Assistant attacks, create a Treasure token.
Hannah's Assistant enters the battlefield tapped
and attacking. Sacrifice that token at the end of
combat.
Double strike
Sass — {3}{r}{r}: Other creatures you control gain double strike until end of turn.