Worldly Tutor

Search your library for a creature card, reveal it, then shuffle and put the card on top.

Manabarbs

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

{T}, Pay 1 life, Sacrifice Arid Mesa: Search your library for a Mountain or Plains card, put it onto the battlefield, then shuffle.

({T}: Add {R} or {G}.)
As Stomping Ground enters, you may pay 2 life. If you don't, it enters tapped.

This spell costs {1} less to cast for each creature on the battlefield.
Blasphemous Act deals 13 damage to each creature.

Earthquake deals X damage to each creature without flying and each player.

Sliver creatures you control have "{T}: Add one mana of any color."

All Slivers have "{T}: Add one mana of any color."

Sliver creatures you control have "Whenever this creature is dealt damage, it deals that much damage to target player or planeswalker."

{T}, Pay 1 life, Sacrifice Wooded Foothills: Search your library for a Mountain or Forest card, put it onto the battlefield, then shuffle.

If a source would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

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