Spellshock

Whenever a player casts a spell, Spellshock deals 2 damage to that player.

Pyretic Ritual

Any player may have Browbeat deal 5 damage to them. If no one does, target player draws three cards.

If a red source you control would deal damage to an opponent or a permanent an opponent controls, it deals that much damage plus 2 instead.

Whenever a player taps a land for mana, Manabarbs deals 1 damage to that player.

Lightning Bolt deals 3 damage to any target.

Flame Rift deals 4 damage to each player.