Yusri, Fortune's Flame (Bundle) [Modern Horizons 2] BW28 put a +1/+1 counter on

put a +1/+1 counter on Champion of the Parish

but after that you run into diminishing returns

Set: The List Type: Legendary Creature — Goblin Shaman Rarity: Rare Cost: {2}{R}{R}{R} Haste

the tomb complex slowly flooded

Set: Secret Lair Drop Series Type: Legendary Creature — Sliver Rarity: Mythic Cost: {W}{U}{B}{R}{G} All Sliver creatures get +1/+1 for each other Sliver on the battlefield

Yusri, Fortune's Flame (Bundle) [Modern Horizons 2] BW28 put a +1/+1 counter onSet: Modern Horizons 2 Type: Legendary Creature Efreet Rarity: Rare Cost: {1}{U}{R} Flying Whenever Yusri, Fortune's Flame 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.