When an opponent's monster declares an attack: You can send this card from your hand to the Graveyard; change the attacking monster to Defense Position. When you Ritual Summon a monster, you can banish this card from your Graveyard as 1 of the monsters required for the Ritual Summon.
If you're planning to build Relinquished 3 copies of it is a must. Any ritual deck fits this card.
[SR] Order to Charge
Select 1 face-up Normal Monster (except a Token) on your side of the field when you activate this card. When this card resolves, Tribute the selected Normal Monster and destroy 1 monster on your opponent's side of the field.
I would not go crazy for it, but if you have only got 8 packs left, you might as well as power through it. The Duel-A-Thon event should give you enough gems by the end. Sphere Kuriboh is still one of the few cards that could save you even against Anti-Magic Arrows and other anti-spell/traps. I would prefer not needing it in the first place tho...