The goal is to "make a profit" with your levels, so you trigger the Degenerator trap only while in Jobs that have bad growths, and then level back up in Jobs with good ones (usually Mime)
Typically it's much more useful to have your movement boosted than being able to jump higher, and if you want to make height a complete nonfactor to your movement, there's the Ignore Height, Fly, and Teleport skills you can invest into instead
None other than the terror that flaps in the night himself Darkwing Duck
One of the best Jund cards in sacrifice-based decks, Korvold grows fairly large and draws you many cards, and its good enough to see Commander and 1v1 Constructed play in Jund decks
Disney Lorcana is a trading card game, also known as a TCG
You can also just reanimate a bunch of huge threats, possibly with a Haste granter and Craterhoof Behemoth support for a sudden alpha strike