While on the topic of mill effects that have flexibility in their uses, some black and Dimir cards come to mind
The recent Universes Beyond addition, Captain America, First Avenger, will probably want a copy of Inventory Management
For example, if you have five permanents with time counters, you could add a time counter to one permanent, remove a time counter from a second permanent, and leave the three other permanents untouched
X Speed is also crucial to reduce the energy lost if you have to pull Charizard back for a turn, as once Crimson Storm is used, you have to discard two energy cards
Because tokens and copies of spells are not cards, even if they are copies of cards, their types will never be counted
Demonstrate allows you to create a copy of Creative Technique, making countering two copies difficult