Cultivate You might be shocked to hear this, but Cultivate is the fourth most popular Commander card, according to EDHREC
The first thing I ask from a potential client is, "what format is this used for?" If they say EDH, that pretty much gives me free reign to go over text boxes or whatever
Cunning Castaway fuels its first ability while protecting itself by creating a 2/2 Illusion token, which is fine
Put X +1/+1 counters on it, where X is the number of growth counters on this enchantment
It's a huge boon to its native deck, acting as a cheap Vedalken Orrery effect for Merfolk spells
Oonas Grace had to cost three mana because a two mana version would grant every land Cycling, but one can imagine an Escape cantrip that costs one mana, but whose Escape costs an exorbitant six cards or four mana (but not both)