When Gem Bazaar comes into play, choose a random color.
: Add to your mana pool one mana of the color last chosen. Then choose a random color.

Randomly distribute X -0/-1 counters among a random number of random target creatures.

When Rainbow Knights comes into play, it gains protection from a random color permanently.
: First strike until end of turn.
: +0/+0, +1/+0 or +2/+0 until end of turn chosen at random.

, , Pay for each target: Tap any number of random target creatures. Goblins tapped in this way do not untap during their controllers' next untap phases.

Play X random fast effects.

Put a random creature from a random graveyard into play under your control. Call from the Grave deals to you an amount of damage equal to that creature's casting cost.

When Aswan Jaguar comes into play, choose a random creature type from those in target opponent's deck.
, : Bury target creature of the chosen type.

Flying
: Play a random effect.

Flying
During your upkeep, Prismatic Dragon becomes a random color permanently.
: Prismatic Dragon becomes a random color permanently.

Whenever a non-black creature is put into any graveyard from play, put a husk counter on Necropolis of Azar.
, Remove a husk counter from Necropolis of Azar: Put a Spawn of Azar token into play. Treat this token as a black creature with a random power and toughness, each no less than 1 and no greater than 3, that has swampwalk.

During each player's upkeep, that player exchanges control of random target artifact, creature or land he or she controls, for control of random target permanent of the same type that a random opponent controls.

, : Choose a random summon card from all players' decks. For each player, flip a coin. If the flip ends up heads, put a token creature into play and treat it as though an exact copy of the chosen summon card were just played.