Urza's Saga's chapter-granted abilities survive Blood Moon because the effects that grant those abilities operate in Layer 6 (ability-adding), which is always applied after Layer 4 (type-changing, where Blood Moon operates). This is determined by layer sequencing, not by timestamp priority.
Urza's Saga's chapter-granted abilities survive Blood Moon because the effects that grant those abilities operate in Layer 6 (ability-adding), which is always applied after Layer 4 (type-changing, where Blood Moon operates). This is determined by layer sequencing, not by timestamp priority.