Whenever a creature enters the battlefield under your control, Impact Tremors deals 1 damage to each opponent.
{R}
Norin the Wary
Legendary Creature - Human Warrior
When a player casts a spell or a creature attacks, exile Norin the Wary. Return it to the battlefield under its owner's control at the beginning of the next end step.
2 /
1
{3}{R}
Purphoros, God of the Forge
Legendary Enchantment Creature - God
Indestructible
As long as your devotion to red is less than five, Purphoros isn't a creature.
Whenever another creature enters the battlefield under your control, Purphoros deals 2 damage to each opponent.
{2}{R}: Creatures you control get +1/+0 until end of turn.
6 /
5
{X}{R}{G}{W}
Rocco, Cabaretti Caterer
Legendary Creature - Elf Druid
When Rocco, Cabaretti Caterer enters the battlefield, if you cast it, you may search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle.