You may choose to target a creature that has mana value greater than 3 even if no player has three of more poison counters
(9/24/2021) "Disturb [cost]" means "You may cast this card transformed from your graveyard by paying [cost] rather than its mana cost." (9/24/2021) When you cast a spell using a card's disturb ability, the card is put onto the stack with its back face up
Gruul has a fair number of haste matters cards like Samut, Vizier of Naktamun and trample matters cards like Quartzwood Crasher
Spellslinger decks already want to leverage cards like Firebrand Archer and Guttersnipe as damage sources, so it takes almost no deckbuilding concessions to make this a nasty card draw engine
Threshold didn't do the best job
Lulu, Forgetful Hollyphant As the only legendary angel creature with the Arena-exclusive mechanic, specialize, Lulu, Forgetful Hollyphant deserves a place here