One of the reasons is that some MtG cards are really old
16,658 Inclusions, 1% of 2,424,972 Decks) Why Monstrosity of the LakeMonstrosity of the Lake sees more play than its non-Commander-deck compatriot probably has everything to do with it being in a Commander precon
Manufacturer: Wizards of the Coast The entire Play Boosters are the ideal booster for the play environment - especially Limited format events
Plus, the ability to discard your hand and draw four cards is a lot of card advantage, so youll often cast a lot of spells, get empty-handed, and just refill by drawing four cards
Since the plan is to sacrifice a lot of saprolings, keep an eye out for spells that give you opportunities to sacrifice creatures and spells like Blood Artist that give you extra benefits when creatures die
'Undersea Adventure' also lets Minnie quest for an extra two lore when you play a second action on your turn - for a total of three