Harvest Wurm is a land recursion card that requires you to return a land or else you have to bury (sacrifice) this summon (creature)
Includes Hamza, Thorn Mammoth, Battle Mammoth, Aggressive Mammoth, Loxodon Smiter, and many more tribal and support cards
And as we played more, it became obvious that our one small dungeon didn't have enough variety from one game to the next to support people jamming in hundreds and hundreds of games, and the sense of exploration would diminish even faster
It fuels your self-mill strategy while protecting you from all-out graveyard hate by creating some small recursion loop
Speaking of drawing cards, the Memory Adept version of Jace can draw cards all day long, and he also serves as a useful way to force someone to mill some cards (if you are into that sort of thing)
Once it's on the battlefield, you can start tapping it to double the number of counters on any two creatures and/or artifacts