Whenever an opponent plays a spell, that player sacrifices a permanent unless he or she pays 1.
Whenever a player taps a Mountain, Forest, or Plains for mana, that player adds one mana to his or her mana pool of any type that land produced.
Obliterate can’t be countered. Destroy all artifacts, creatures, and lands. They can’t be regenerated.
Whenever Elvish Mariner attacks, scry 1. Whenever you scry, tap up to X target nonland permanents, where X is the number of cards looked at while scrying this way.
Return a Forest you control to its owner's hand: Untap target creature. Activate only once each turn.
2WW, T, Exile Urza's Sylex: Each player chooses six lands they control. Destroy all other permanents. Activate only as a sorcery. When Urza's Sylex is put into exile from the battlefield, you may pay 2. If you do, search your library for a planeswalker card, reveal it, put it into your hand, then shuffle.
Look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order. Proliferate.
Haste Whenever Squee, Dubious Monarch attacks, create a 1/1 red Goblin creature token that's tapped and attacking. You may cast Squee, Dubious Monarch from your graveyard by paying 3R and exiling four other cards from your graveyard rather than paying its mana cost.
Choose two target creature cards in your graveyard. Sacrifice a creature. If you do, return the chosen cards to the battlefield tapped.
Choose two — • Target player gains 7 life. • Put target noncreature permanent on top of its owner's library. • Target player shuffles their graveyard into their library. • Search your library for a creature card, reveal it, put it into your hand, then shuffle.