Questing Druid is less of a specific Gruul payoff than a multicolor payoff given how it grows when you cast spells, but its quite happy in a Gruul-only deck
Every standard 30-pack Japanese booster box from the Scarlet & Violet era (SV1 onward) contains 2-4 SAR cards on average, though the specific SAR you pull is random
By playing enough of both, you'll be passively gaining lore, draining your opponent, and have a board state that will be very tricky for your opponent to unpick in time
Rate limits use a credit-based system: Free tier includes 100 credits/day, API tier ($9.99/mo) includes 20,000 credits/day, and Business tier ($99/mo) includes 200,000 credits/day
Poker cards They are usually the classical dimension of 2.5 x 3.5, ideal for shuffling, dealing, and gripping during a poker game