Spin Engine [Mirrodin Besieged] Yami Yugi or Effect Monster's effect activates

or Effect Monster's effect activates

Set: Dark Crisis Card type: Normal Trap Rarity: Common Attack: 0 Defense: 0 You can only activate this card when your opponent declares an attack

What is so confusing about that

"I don't know where my destiny lies

Set: Core Set 2019 Type: Creature — Vampire Rarity: Common Cost: {B} {2}

Spin Engine [Mirrodin Besieged] Yami Yugi or Effect Monster's effect activatesSet: Mirrodin Besieged Type: Artifact Creature Construct Rarity: Common Cost: {3} {R}: Target creature can't block Spin Engine this turn. "It will be battle ready before our strike at Oxid Ridge, and it will guarantee our victory." Ketuc of the Helm