Mana Web

Whenever a land an opponent controls is tapped for mana, tap all lands that player controls that could produce any type of mana that land could produce.

Mana Maze

Players can't cast spells that share a color with the spell most recently cast this turn.

Yasova Dragonclaw

Trample
At the beginning of combat on your turn, you may pay {1}{U/R}{U/R}. If you do, gain control of target creature an opponent controls with power less than Yasova Dragonclaw's power until end of turn, untap that creature, and it gains haste until end of turn.

Mana Geyser

Add {R} for each tapped land your opponents control.

Quest for Renewal

Whenever a creature you control becomes tapped, you may put a quest counter on Quest for Renewal.
As long as there are four or more quest counters on Quest for Renewal, untap all creatures you control during each other player's untap step.

Manabarbs

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

Price of Glory

Whenever a player taps a land for mana, if it's not that player's turn, destroy that land.

Mana Vapors

Lands target player controls don't untap during their next untap step.

Drain Power

Target player activates a mana ability of each land they control. Then that player loses all unspent mana and you add the mana lost this way.

Mana Short

Tap all lands target player controls and that player loses all unspent mana.

Natural Affinity

All lands become 2/2 creatures until end of turn. They're still lands.

Mana Breach

Whenever a player casts a spell, that player returns a land they control to its owner's hand.