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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, that player adds one mana of any type that land produced.

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 player...

Flying (This creature can't be blocked except by creatures with flying or reach.)

Blue creatures don't untap during their controllers' untap steps. At the beginning of each player's upkeep, that player may choose any number of ta...

Change the text of target spell or permanent by replacing all instances of one basic land type with another. (For example, you may change "swampwal...

Hammer of Bogardan deals 3 damage to any target. {2}{R}{R}{R}: Return this card from your graveyard to your hand. Activate only during your upkeep.

At the beginning of each player's upkeep, that player chooses a color. Until end of turn, lands tapped for mana produce mana of the chosen color in...

{3}, {T}: Target player mills two cards. If two cards that share a color were milled this way, repeat this process.

Flying, trample At the beginning of your upkeep, sacrifice a creature other than this creature. If you can't, this creature deals 7 damage to you.

Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)

All Forests are 1/1 creatures that are still lands.

Enchant artifact Whenever you're dealt damage, put that many vitality counters on this Aura. At the beginning of your upkeep, you may remove a vita...

Target spell or permanent becomes green. (Mana symbols on that permanent remain unchanged.)

As an additional cost to cast this spell, discard X cards. Firestorm deals X damage to each of X targets.

As an additional cost to cast this spell, discard X cards. Firestorm deals X damage to each of X targets.

Trample This creature enters tapped and doesn't untap during your untap step. At the beginning of your upkeep, you may sacrifice two Islands. If yo...

Take an extra turn after this one. At the beginning of that turn's end step, you lose the game.

At the beginning of your upkeep, if an opponent controls more lands than you, you may search your library for up to three basic land cards, reveal ...

All Swamps are 1/1 black creatures that are still lands.

{T}: Switch target creature's power and toughness until end of turn.

{4}, {T}: Draw a card.

{3}, {T}: Choose a card name, then reveal a card at random from your hand. If that card has the chosen name, this artifact deals 2 damage to any ta...

{3}, {T}: Untap target creature.