This artifact is a great backup ramp resource in any deck but excels in decks that specifically care about Treasure tokens, like Jolene, the Plunder Queen and Vazi, Keen Negotiator
Green has enough 1-mana accelerants to reliably play this turn 2 then get some meaty stuff down turn 3 onward
whoops.) And am also considering putting in Swan Song as well, as a cheap counter-spell
Any of the "whenever a card leaves your graveyard" enablers, from Teval's Judgment to Syr Konrad, the Grim to On Wings of Gold, are crucial to Varina
She makes people discard cards, sacrifice creatures and eventually choose around half of their permanents to sacrifice
You can then tap the Crucible and remove storage counters to gain that much mana in any combination of colors - solely for casting Dragon spells or activating Dragon abilities