The triggered ability triggers only if the creature that has it is on the battlefield as you cast your second spell
The Connive keyword currently features on 35 cards, including the two previewed in this set
Flavor Text: Fendros gasped as he watched the spell drip from the ends of his fingers
That means Mulldrifter draws you two cards when you first cast it, then another two cards at the end of your turn, and another two cards at the end of every future turn
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Or you could use cards like Merfolk Looter and pitch big, splashy spells into the graveyard you can flash back for cheap, like Ezuris Predation, Clone Legion, or Insurrection