TCG Rulings

• You cannot activate this card during the Damage Step. ^[1]

• You cannot activate this card if there are no face-up monsters on the field. ^[1]

• You cannot activate this card if a face-up monster is removed from play as a cost. ^[1]

• You cannot activate this card when a Token or a Trap Card treated as a monster is removed from play. ^[1]

• You can activate this card if your monster is destroyed by "Acid Trap Hole" while "Macro Cosmos" is on the field. ^[1]

References

1. ↑ ^{1.0 1.1 1.2 1.3 1.4} Konami Gameplay FAQ: Storm of Ragnarok -- Card Rulings (Version 1.0)