Valiant Emberkin

Haste Whenever this creature enters or attacks, target creature you control perpetually gets +1/+0. If a creature you control becoming the target of a spell or ability causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oliryfmzvpb1hf4ubvd9k.