The most popular one requires three cards, draws your deck, and exiles all your opponents' stuff
With four Cast Downs, three Mortifies, three Vraskas Contempts, and an unbeatable Profane Procession, Izzet Drakes has an impossible time keeping their threats alive
Some companies offer authenticity-checking services for Magic cards
This is at its best in decks that really, really want the mana advantage
The answer changes every time, so theres no clear-cut solution other than look it up. If youve only got a handful of cards to sell and dont mind putting in a little extra time, or if you need to squeeze every last dime out of a card, this isnt your best bet
The other half of the card does not matter once the first half has been cast