Since Te Ka - Heartless has the perfect cost as a curve-topper, its on the verge of bomb territory, and it would be my pick out of this pack
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Time Vault Tap: Take an extra turn. Thats basically what it says, once you figure out how to untap it effectively
Hammer of Nazahn $2.49 Indestructible is one of the best abilities in Commander, and Hammer of Nazahns first ability makes it an auto-include in any deck with a critical mass of Equipment
The second, a Mardu list centered around tokens, uses many Mobilize cards
As long as it hasn't previously been opened and you don't know the contents beforehand, you're good