The eleventh card is Vrains Kuriboh. This one is a Link monster that needs a level 1 sacrifice to summon. It can be sacrificed to temporarily set an attacking monsters atk to 0, and it can be summoned from the graveyard just like if it was in the extra deck, though you can only summon it from the graveyard once a turn. As long as your deck includes level 1 monsters Linkuriboh can be added to the Extra Deck as a nice option to stall things.