You may look at the top card of your library any time. You may play lands and cast spells from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost. {T}, Sacrifice ten nonland permanents: Each opponent loses 10 life.

Whenever an opponent loses life, that player mills that many cards. (Damage causes loss of life.)

{1}: Look at the top three cards of your library, then put them back in any order. {T}: Draw a card, then put this artifact on top of its owner's library.

At the beginning of your upkeep, reveal the top card of your library and put that card into your hand. You lose life equal to its mana value.

At the beginning of each end step, if an opponent lost 2 or more life this turn, you may put a quest counter on this enchantment. (Damage causes loss of life.) Whenever a card is put into an opponent's graveyard from anywhere, if this enchantment has three or more quest counters on it, you may have that player lose 2 life. If you do, you gain 2 life.

At the beginning of each player's upkeep, that player discards a card at random.

At the beginning of each player's upkeep, that player discards a card.

Whenever a player casts a spell, that player discards a card.

Whenever an opponent casts a spell, that player loses 5 life unless they discard a card.

Whenever an opponent discards a creature card, create a 2/2 black Zombie creature token. Whenever an opponent discards a land card, add {B}{B}. Whenever an opponent discards a noncreature, nonland card, draw a card.

Add {B}{B}{B}. Threshold — Add {B}{B}{B}{B}{B} instead if seven or more cards are in your graveyard.

Add {B}{B}{B}.

If you control a commander, you may cast this spell without paying its mana cost. Exile target creature.

Target creature gets -1/-1 until end of turn for each Swamp you control.

You draw two cards and each opponent discards two cards. Each player loses 2 life.

Choose a nonland card name. Target player reveals their hand and discards all cards with that name. Flashback—Sacrifice a creature. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Target player discards two cards. That player may copy this spell and may choose a new target for that copy.

Each player discards all the cards in their hand, then draws that many cards minus one.

Each player discards three cards.

Target player reveals their hand. You choose an artifact or creature card from it. That player discards that card.

Target player discards X cards at random.