Well of Lost Dreams

Whenever you gain life, you may pay , where X is less than or equal to the amount of life you gained. If you do, draw X cards.

Well of Lost Dreams

Whenever you gain life, you may pay , where X is less than or equal to the amount of life you gained. If you do, draw X cards.

Bamboozling Beeble

Protection from Robots
, : The next time target player would roll one or more dice this turn, instead they roll that many dice plus one and you choose one of those rolls to ignore.

Comet, Stellar Pup

0: Roll a six-sided die.
1 or 2 — [+2], then create two 1/1 green Squirrel creature tokens. They gain haste until end of turn.
3 — [−1], then return a card with mana value 2 or less from your graveyard to your hand.
4 or 5 — Comet, Stellar Pup deals damage equal to the number of loyalty counters on him to a creature or player, then [−2].
6 — [+1], and you may activate Comet, Stellar Pup’s loyalty ability two more times this turn.

Cover the Spot

Visit — Drop three cards you own from outside the game one at a time onto the playing area from a height of at least one foot (about 0.3 meters). If those cards completely cover Cover the Spot, claim the prize!
Prize — You get {TK}{TK}{TK}{TK}, then you may put a sticker on a nonland permanent you own. Sacrifice Cover the Spot, then open an Attraction.

Livaan, Cultist of Tiamat

Whenever you cast a noncreature spell, target creature gets +X/+0 until end of turn, where X is that spell’s mana value.
Choose a Background (You can have a Background as a second commander.)

Wipe Away

Split second (As long as this spell is on the stack, players can’t cast spells or activate abilities that aren’t mana abilities.)
Return target permanent to its owner’s hand.

Primal Forcemage

Whenever another creature enters the battlefield under your control, that creature gets +3/+3 until end of turn.

Ivory Giant

When Ivory Giant enters the battlefield, tap all nonwhite creatures.
Suspend 5— (Rather than cast this card from your hand, you may pay and exile it with five time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)

Kardur, Doomscourge

When Kardur, Doomscourge enters the battlefield, until your next turn, creatures your opponents control attack each combat if able and attack a player other than you if able.
Whenever an attacking creature dies, each opponent loses 1 life and you gain 1 life.

Valki, God of Lies // Tibalt, Cosmic Impostor

When Valki enters the battlefield, each opponent reveals their hand. For each opponent, exile a creature card they revealed this way until Valki leaves the battlefield.
: Choose a creature card exiled with Valki with converted mana cost X. Valki becomes a copy of that card.

Kardur, Doomscourge

When Kardur, Doomscourge enters the battlefield, until your next turn, creatures your opponents control attack each combat if able and attack a player other than you if able.
Whenever an attacking creature dies, each opponent loses 1 life and you gain 1 life.

Changeling Hero

Changeling (This card is every creature type.)
Champion a creature (When this enters the battlefield, sacrifice it unless you exile another creature you control. When this leaves the battlefield, that card returns to the battlefield.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

B.O.B. (Bevy of Beebles)

As B.O.B. (Bevy of Beebles) enters the battlefield, create four 1/1 blue Beeble creature tokens.
The number of loyalty counters on B.O.B. is equal to the number of Beebles you control. (Create or sacrifice Beebles whenever B.O.B. gains or loses loyalty.)
+1: Up to X target Beebles can’t be blocked this turn, where X is the number of cards in your hand.
−1: Draw a card.

Krark’s Other Thumb

If you would roll a die, instead roll two of those dice and ignore one of those results.

Topsy Turvy

The phases of each player’s turn are reversed. (The phases are, in reverse order, ending, postcombat main, combat, precombat main, and beginning.)
As long as there are more than two players in the game, the turn order is reversed.

Floodgate

Defender (This creature can’t attack.)
When Floodgate has flying, sacrifice it.
When Floodgate leaves the battlefield, it deals damage equal to half the number of Islands you control, rounded down, to each nonblue creature without flying.

Nameless Inversion

Changeling (This card is every creature type.)
Target creature gets +3/-3 and loses all creature types until end of turn.

Sulfurous Blast

Sulfurous Blast deals 2 damage to each creature and each player. If you cast this spell during your main phase, Sulfurous Blast deals 3 damage to each creature and each player instead.

Manamorphose

Add two mana in any combination of colors.
Draw a card.