Alpine Houndmaster

When this creature enters, you may search your library for a card named Alpine Watchdog and/or a card named Igneous Cur, reveal them, put them into your hand, then shuffle. Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of other attacking creatures.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o9dr564wdpb1hrot7fmso.