For those cards, they will show up in this slot half as often as cards of their equivalent rarity in the same treatment
Moana, Huey, Scrooge, and Gyro are heavily situational, relying on either locations, items, or synergies with specific cards to find value
Remember that Amalgams ability isnt a may ability, so once triggered, it has to be returned to the battlefield
Once a creature's ward ability has triggered, causing that creature to lose ward by removing Cathedral Acolyte won't affect the ability
Drawing two cards OR removing a creature while also ramping into future turns is also powerful enough for it to see Standard play
Anyhoo, I like this card in decks where you can pop it for all that lovely card draw