Warded Battlements

Defender (This creature can't attack.)
Attacking creatures you control get +1/+0.

Goblin War Drums

Creatures you control have menace. (They can't be blocked except by two or more creatures.)

Alpine Houndmaster

When Alpine Houndmaster 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 Alpine Houndmaster attacks, it gets +X/+0 until end of turn, where X is the number of other attacking creatures.

Igneous Cur

{1}{R}: Igneous Cur gets +2/+0 until end of turn.

Alpine Watchdog

Vigilance (Attacking doesn't cause this creature to tap.)