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Ultimately it's up to the Head Judge of whatever event you play in. Weekly at your LGS? It's probably fine. SCG Open? Better have a backup plan.

While I don't think this is nearly as big of a...

Gitrog reads "Whenever one or more land cards are put into your graveyard from anywhere, draw a card." So even if you dredge 2 lands, you only get one trigger. So each dredge has a binary value....

Nevermaker's effect is an LTB trigger, not an ETB trigger. In a vacuum, if you need the trigger now, you evoke him. In this context though, you're right.

FTFY.

Rotting Rats seems especially fun, with the Unearth interaction being similar to the evoke one discussed above.