Arrester's Zeal

Instant

Target creature gets +2/+2 until end of turn. Addendum — If you cast this spell during your main phase, that creature gains flying until end of turn.

"Law is the light of civilization."

Legalities

standardpioneermodernlegacyvintagepaupercommanderbrawl

Rulings (2)

2024-01-12 If an effect copies a spell with an addendum ability while it's on the stack, the copy wasn't cast at all, so you won't get the addendum bonus.
2024-01-12 Addendum abilities of instant spells apply while the spell is resolving, not immediately after casting it. If the spell is countered, you don't get the addendum bonus.