The twenty-first card is Winged Kuriboh, from Yu-Gi-Oh GX. This one only has one effect, if it gets destroyed and sent to the graveyard then you take no battle damage for the rest of the turn. This works best if you can make your opponent hit Winged Kuriboh first, or if you destroy it via card effect during your opponents turn. Using it with things like Two Pronged Attack or Generation Shift would work wonderfully. Other than its effect this card also has the ability to be used to summon Winged Kuriboh LV10, which can then be used to destroy all your opponents monsters and deal their ATK as damage. It can stall for a turn, or be used in a combo to wipe out your opponents monsters and deal a good amount of damage to them, if you have room it seems like a pretty good addition to a deck.