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.

Natural Affinity

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

Mana Maze

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

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.

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 Short

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

Manabarbs

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

Quest for Renewal

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

Price of Glory

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

Mana Breach

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