In my opinion, Alchemy should be the right place to fix some errors and ill mechanics Magic has always had. One of them are the infinite mana/life/damage combos of cards.
When Riveteers Boss give any card permanent "when played put a treasure token" ability, it's quite clear where any game is going. Grinning Ignus doesn't even need extra card to "pay R and return this to your hand". If you add Witty Roastmaster to this combo, welcome infinitely annoying mana and damages combo. Instant win and an instant lose for Magic Alchemy gameplay.