Impatient Iguana

If Impatient Iguana is in your opening hand and you're not the starting player, you may reveal it. If you do, you become the starting player.
Haste

Zndrsplt, Eye of Wisdom

Partner with Okaun, Eye of Chaos (When this creature enters, target player may put Okaun into their hand from their library, then shuffle.)
At the beginning of combat on your turn, flip a coin until you lose a flip.
Whenever a player wins a coin flip, draw a card.

How to Keep an Izzet Mage Busy

Return How to Keep an Izzet Mage Busy to its owner's hand.

Pokey, the Scallywagg

Menace
If you would flip a coin, you may instead roll a d20. 1−10 is tails and 11−20 is heads. (It counts as rolling a die, not flipping a coin.)
If you would roll a d20, you may instead flip a coin. Tails is 1 and heads is 20. (It counts as flipping a coin, not rolling a die.)

Microscope

{T}: Surveil 1.
{T}: Target permanent card in a graveyard becomes a 0/0 black Germ creature in addition to its other colors and types until end of turn. (This effect ends if it leaves the graveyard.)

Yusri, Fortune's Flame

Flying
Whenever Yusri attacks, choose a number between 1 and 5. Flip that many coins. For each flip you win, draw a card. For each flip you lose, Yusri deals 2 damage to you. If you won five flips this way, you may cast spells from your hand this turn without paying their mana costs.

Okaun, Eye of Chaos

Partner with Zndrsplt, Eye of Wisdom (When this creature enters, target player may put Zndrsplt into their hand from their library, then shuffle.)
At the beginning of combat on your turn, flip a coin until you lose a flip.
Whenever a player wins a coin flip, double Okaun's power and toughness until end of turn.

Farideh, Devil's Chosen

Dark One's Own Luck — Whenever you roll one or more dice, Farideh gains flying and menace until end of turn. If any of those results was 10 or higher, draw a card.

Terry Pin, Turboturtle

Flash
Haste
You may ignore the words "Activate only as a sorcery" while activating abilities.

Luxior, Ignited

Equipped creature gets +1/+1 for each counter on Luxior, Ignited.
+1: Attach this Equipment to up to one target creature you control.
−2: Equipped creature gets +2/+2 and gains double strike until end of turn.