Creatures without flying or islandwalk can't attack.
Whenever you roll {CHAOS}, until a player planeswalks, you can't lose the game and your opponents can't win the game.
Imprint — When Chrome Mox enters the battlefield, you may exile a nonartifact, nonland card from your hand.
: Add one mana of any of the exiled card's colors.
: Add one mana of any color.
: Put a charge counter on Coalition Relic.
At the beginning of your precombat main phase, remove all charge counters from Coalition Relic. Add one mana of any color for each charge counter removed this way.
: Destroy target creature blocking or blocked by Cromat.
: Cromat gains flying until end of turn.
: Regenerate Cromat.
: Cromat gets +1/+1 until end of turn.
: Put Cromat on top of its owner's library.
, , Discard a card: Choose a card name. Exile the top six cards of your library, then reveal cards from the top of your library until you reveal a card with the chosen name. Put that card into your hand and exile all other cards revealed this way.
Flying
When Doomsday Specter enters the battlefield, return a blue or black creature you control to its owner's hand.
Whenever Doomsday Specter deals combat damage to a player, look at that player's hand and choose a card from it. The player discards that card.
, : An opponent chooses target creature they control. Create a token that's a copy of that creature. That token gains haste until end of turn. Exile the token at the beginning of the next end step. Activate this ability only any time you could cast a sorcery.
, : Put an elixir counter on Essence Bottle.
, Remove all elixir counters from Essence Bottle: You gain 2 life for each elixir counter removed this way.
Flaming Gambit deals X damage to target player or planeswalker. That player or that planeswalker's controller may choose a creature they control and have Flaming Gambit deal that damage to it instead.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)