"Discard" in Magic means specifically hand to graveyard.) Perhaps you were confused by the fact that it says "...from your hand" in the reminder text, making you think that you could somehow cast just one part of it out of your hand, leaving the other part there
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This is a little more flexible than the other choice on the list because you can get any permanent
It's incredibly easy to achieve delirium when you're also activating surveil regularly, and that makes this a very consistent beatdown
This page shows current market prices, recent eBay sales, PSA graded values, and price history for this Rare card from Legendary Collection
Financially there will probably be some great long-term spec opportunities here, but save that for a month or two after release