One of the best-case scenarios if youre looking to run Smelting Vat in your deck is to sacrifice a Spine of Ish Sah, digging for up to two artifacts with a combined mana value of six
6 Kraum, Ludevic's Opus The blue part of the Blue Farm cEDH list, Kraum, Ludevc's Opus often comes together with Tymna the Weaver to make one of the best decks in the format
Selvala just wants you to play large Creatures, protect her, and enjoy having absurd amounts of mana, all while drawing cards to eventually sink it all into
The last ability is especially useful in multiplayer matches
Xanathar, Guild Kingpin, for example, is the beholder at the centre of the Xanathar Thieves Guild and here allows you to steal other peoples cards straight from their libraries
The earlier you play Mystic Remora (ideally on turn 1 or 2), the more cards youll draw because players wont be able to pay the mana for all the ramp spells they're likely to deploy