My Undead Horde Awakens (Schemes) [Archenemy Schemes] SV012 when another monster's effect is

when another monster's effect is activated (Quick Effect): You can negate the activation

you may pay {1} any time you could cast an instant

This can only be Special Summoned by Tributing "Sanha of the Thunder"

each defending player chooses any number of creatures they control and divides them into a number of piles equal to the number of attacking creatures for whom that player is the defending player

My Undead Horde Awakens (Schemes) [Archenemy Schemes] SV012 when another monster's effect isSet: Archenemy Schemes Type: Ongoing Scheme Rarity: Common (An ongoing scheme remains face up until it's abandoned.) At the beginning of your end step, you may put target creature card from an opponent's graveyard onto the battlefield under your control. When a creature put onto the battlefield with this scheme dies, abandon this scheme.