Number 38: Hope Harbinger Dragon Titanic Galaxy X LIGHT Rank 8 [ Dragon / XyzEffect ] ATK 3000 DEF 2500 2 Level 8 monsters Once per turn, when a Spell Card or effect is activated on the field (Quick Effect): You can negate that effect, and if you do, attach that card to this card as material
In the other scenario you hold back
Unfortunately, while this setup is fine in chess, it doesn't work particularly well in "Yu-Gi-Oh!" In chess, both sides are of equal power
Skithiryx the Blight Dragon might be a good inclusion, or perhaps Ria Ivor, Bane of Bladehold to support a more go wide approach
What they do instead, is grant each instant and sorcery in your graveyard flashback, with the cost being equal to that cards mana cost
It won't have "Whenever this creature attacks, it connives." Once an ability that causes a creature to connive begins to resolve, no player may take any other actions until it's done