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'Tap all lands target player controls and that player loses all unspent mana.
'Whenever a player taps a land for mana, this enchantment deals 1 damage to that player.
'At the beginning of each player's end step, put a charge counter on this enchantment for each untapped land that player controls. Remove a charge counter from this enchantment: Add...
'If an opponent cast three or more spells this turn, you may pay {0} rather than pay this spell's mana cost.
Exile any number of target spells.
'Players can't cast spells that share a color with the spell most recently cast this turn.
'Whenever a player taps a land for mana, that player adds one mana of any type that land produced.
'Add {R} for each tapped land your opponents control.
'{3}, {T}: Target player discards a card. Activate only during your turn.
'You and target opponent each flip a coin. Mana Clash deals 1 damage to each player whose coin comes up tails. Repeat this process until both players' coins come up...
'Counter target spell unless its controller pays {1}.
{T}, Pay 1 life: Add one mana of any color.
'If an opponent cast three or more spells this turn, you may pay {0} rather than pay this spell's mana cost.
Exile any number of target spells.