Getting a creature with deathtouch for 3 mana will give you a massive defense that isnt easily removed
None other than the terror that flaps in the night himself Darkwing Duck
Putting cards back into your opponents deck means you wont have to deal with them for a while
Environmental Factors : Over time, exposure to sunlight, moisture, and fluctuations in temperature can affect the weight, color, and integrity of the cards
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
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)