The cards in Mystery Booster packs go as far back as 1996's Mirage
Remember: you can play it on your opponent's turn, you don't have to play it on your opponent's turn
Opt is a combat trick with prowess dorks or zero mana when you want to keep mana up to represent counterspells and you really don't need much extra on a one mana cantrip for it to be nuts
And its a common, so I know were going to get half a dozen or so in various packages
Flying / First Strike / Double Strike / Vigilance / Deathtouch / Unblockable / Shroud / Indestructible / Flash / Trample / Haste / Regenerate / Life Link / cost reduction / Pay 2 life return to hand / +X/+0 / and lets not forget the classic +X/+X This deck also has numerous ways to get Slivers back from the graveyard or to keep them from dying with Hibernation Sliver, Sedge Sliver, Sliver Hivelord, Crystalline Sliver, and Patriarch's Bidding as I previously mentioned
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