fusion monster cards yugioh YU-GI-OH! - Reserve (MP15-EN185) - Mega Pack 2015 - 1st Edition It gains 700 ATK Fusion Summon From Deck :

When you play him, you can put him out already exerted so this effect works straight away

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BPhillipYork: This can be broken, there's way to create mana enough to blink this, Dockside Extortionist is an obvious huge mana generator here, but there's also Su-Chi and other sources, you could also do something like sacrificing Gnawing Vermin or Stitchers Supplier and generate a lot of mill, if you were into that sort of thing

But it 's Timestream Navigator that is the most interesting

Threaten effects, or effects that temporarily steal opposing creatures, aren't super popular in Commander, though the equation certainly changes when that threat's attached to a 10/10 and also morphs the 'borrowed' creature into an annihilating monster for the turn