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'Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.
'If you tap a permanent for mana, it produces twice as much of that mana instead.
'Players can't cast spells that share a color with the spell most recently cast this turn.
'Add two mana in any combination of colors.
Draw a card.
'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.
'Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.
'Whenever this creature attacks, you may pay {1}{R} and discard a card. If you do, this creature deals damage to target creature or planeswalker equal to the discarded card's mana...
'Add {R} for each tapped land your opponents control.
'If a player would add mana, instead all players add that mana.
'This land enters tapped.
When this land enters, sacrifice it unless you pay {1}.
{T}: Add one mana of any color.
'Whenever a player taps a land for mana, that player adds one mana of any type that land produced.
{T}, Pay 1 life: Add one mana of any color.