I think that the most powerful mill pieces are the ones that require minimal extra work from the mill player, and Mindcrank is a prime example
Oswald has been a heavily requested character since Lorcanas debut, as he served as the mascot of Disney before Mickey Mouse
Picking up another Engineered Explosives stand-in will help there, and Blast Zone contributes to Amulet Titans ability to find answers to absolutely every problem given enough time and mana
Torens, Fist of the Angels does two things well - he creates creature tokens and he puts +1/+1 counters on creatures
At the beginning of your end step, if this creature didnt enter the battlefield this turn, return it to its owners hand
Its less deep than Magic, but the gameplay is solid, and the core mechanics provide a lot of opportunity for future card designs