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'Treat your effects that scale off of "players" or "opponents" as though there were one more. (For example, with myriad you'd make an additional token that's just attacking nobody, and...
'The Watcher in the Water enters tapped with nine stun counters on it. (If a permanent with a stun counter would become untapped, remove one from it instead.) Whenever you...
When Joshua enters, discard up to two cards, then draw that many cards. {3}{R}{W}, {T}: Exile Joshua, then return it to the battlefield transformed under its owner's control. Activate only...
'Flying Whenever this creature deals combat damage to a player, search that player's library for a card, then that player chooses a card name. If you searched for a creature...
'Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Draw two cards.
'Flying, haste Whenever a creature you control with flying and/or haste attacks, you get 20% cooler. (You start at 0% coolness.) Sonic Rainboom — {T}: If you're at least 100%...
'{T}, Pay 1 life: Add {B} or {R}. {1}{B}{R}, {T}: Mount Doom deals 1 damage to each opponent. {5}{B}{R}, {T}, Sacrifice Mount Doom and a legendary artifact: Choose up to...
'Play with the top card of your library revealed. As long as the top card of your library is black, this creature and other Vampire creatures you control get +2/+1...
'Kicker {W} (You may pay an additional {W} as you cast this spell.)
Target player can't cast spells this turn. If this spell was kicked, creatures can't attack this turn.
'Whenever you cast a signed spell or play a signed land, copy it. (A signed card is a card signed by its artist, designer, or someone else it's strongly associated...
'At the beginning of each player's upkeep, this artifact deals 1 damage to that player.
'{2}{U}{U}, {T}: Draw a card for each Wizard you control.