the Beyond Booster is going to be the main way into that expansion aside from Collector Boosters
Jaberwocki is playing 19 lands (16+3 MDFCs), 16 lands, or maybe some number in between that, depending on your interpretation
If the enchanted creature is no longer on the battlefield when Penumbra Umbra's second ability resolves, use its copiable values as it last existed on the battlefield
Recast the rock, repeating the loop to mill your library and generate mana
Defense of the Heart Details Color Identity: Green Card Type: Enchantment Text: At the beginning of your upkeep, if an opponent controls three or more creatures, sacrifice Defense of the Heart, search your library for up to two creature cards, put those cards onto the battlefield, then shuffle
Of course, this is a fact that wont hurt their perceived value