Most Valuable Slayer

Whenever you attack, target attacking creature gets +1/+0 and gains first strike until end of turn.

Rampaging Soulrager

Rampaging Soulrager gets +3/+0 as long as there are two or more unlocked doors among Rooms you control.

When Piggy Bank dies, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Haste
When Clockwork Percussionist dies, exile the top card of your library. You may play it until the end of your next turn.

{1}, {T}: Target creature with power 2 or less can't be blocked this turn.

Whenever another creature you control with power 2 or less enters, Vicious Clown gets +2/+0 until end of turn.