BSS02-128 The Three Cards

Ability / Effect
[Burst: When Opponent Resolves a Spirit's "When Summoned" Effect]
During this turn, all of your spirits gain Otherlander spirit type. You may then pay this card's cost to activate its main effect.

[Main]
If you have three or more Otherlander spirits, all of your opponent’s nexuses lose their effects and cannot regain them during this turn.