mtg creature copy cards Mimic Token You may have Clever Impersonator enter the battlefield as a copy of any nonland permanent on the battlefield. Copy - MTG Wiki

It is automatic when I see a card that would have once been good enough to think about it in the context of cube

Cascade specifically says that you may cast the card you cascade into

In this case you are playing a card and discarding a card to draw 2 cards which is a net of 0

This could be through dealing a certain amount of damage

Top 10 by USD in Scryfall (12/26/2024) Delney, Streetwise Lookout Bloodthirsty Conqueror Wolverine, Best There Is Rev, Tithe Extractor Vaultborn Tyrant Ocelot Pride Captain America, First Avenger Bristly Bill, Spine Sower Tamiyo, Inquisitive Student Storm, Force of Nature I'd bet the dollar value of the Marvel cards is high largely due to scarcity, but this list is also from Scryfall, which has little relation to how much a card is played in EDH

This three-mana spell stops your life total from changing and everything you control phases out of the game until your next turn, rendering you all but untouchable