Obidiah, Grisbrake Sell-Sword

First strike
Mana value of each Mercenary card in your library is 1.
At the beginning of your upkeep, shuffle Obidiah, Grisbrake Sell-Sword into its
owner's library unless you pay {3} or discard
a card.
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https://mtgcardsmith.com/user/Obidiah
https://mtgcardsmith.com/user/Obidiah/sets/59932