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Some Flip Card Rules Section 710 of the Comprehensive Rules , November 8, 2024, describes how Flip Cards function

If the Witch-King's controller takes combat damage, then the opponent must sacrifice one of their creatures that dealt damage to the defending player

Getting a card appraised by the PSA helps establish its real value, so any serious card sale requires grading

Draw bolted onto something you would otherwise pay a card for is worth more like 2 mana and not the single mana it costs when found on its own or near enough to

Still, I believe that Expressive Iteration actually has deck building restrictions to it, being almost non-abusable in combo decks and holds up a much lower ceiling in Control decks

There are lots of fancy calculators that can show you how many lands you should play