If you can grow Esper Sentinel's stats, it makes it even harder to pay for the tax, almost guaranteeing you'll be able to draw the card from its trigger.
This is a much harder recommendation than normal, because there are some big hurdles standing between the cards and the consumer
Now, you dont quite win the game on the spot, but if youre able to navigate a game into a position where you are able to protect your Karn and resolve Mycosynth Lattice, your opponent will be completely stripped of their ability to cast anything else, thanks to the one-two punch of Lattice turning all opposing lands in artifacts that now cannot be activated thanks to Karn
Those decks often rely on creatures in the graveyard as well, so that can be a nice boon here
So if you, like me, are searching for a deck that scratches that Izzet Spellslinger itch but don't want to drown the table chaining spells and resolving a tidal wave of triggered abilities, Melek, Reforged Researcher might be for you