Karn’s Sylex enters tapped.
Players can’t pay life to cast spells or to activate abilities that aren’t mana abilities. , , Exile Karn’s Sylex: Destroy each nonland permanent with mana value X or less. Activate only as a sorcery.
If a spell or an activated ability that isn’t a mana ability has a cost that requires a player to pay life, that spell or ability can’t be cast or activated.
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Other things may still cause players to pay life, such as a resolving spell or ability.
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Players may always pay 0 life, even if an effect says they can’t pay life.
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Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keyword abilities are activated abilities (such as cycling) and will have colons in their reminder text.
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An activated mana ability is one that produces mana as it resolves, not one that costs mana to activate.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.