Sigurd, Jarl of Ravensthorpe

{R}{G}{W}Legendary Creature — Human Warrior3/3

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Vigilance, trample, lifelink

Boast — {1}: Put a lore counter on target Saga you control or remove one from it. (Activate only if this creature attacked this turn and only once each turn.)

Whenever you put a lore counter on a Saga you control, put a +1/+1 counter on up to one other target creature.

Keyword reminders

Lifelink. Damage dealt by this also causes its controller to gain that much life. · CR 702.15

Vigilance. Attacking doesn't cause this creature to tap. · CR 702.20

Trample. Excess combat damage beyond what's lethal to blockers can be assigned to the player or planeswalker it's attacking. · CR 702.19

Official rulings

If a creature with a boast ability is put onto the battlefield attacking, it was never declared as an attacker. Its boast ability can’t be activated that turn. (2024-07-05)
If it’s not your turn and you gain control of a creature with a boast ability after that creature attacked, you can activate that creature’s boast ability if it hasn’t been activated yet that turn. (2024-07-05)
A boast ability can be activated at any point after the creature with that ability has been declared as an attacker. This can be before blockers are declared, after blockers are declared but before combat damage is dealt, during combat after combat damage is dealt, during the postcombat main phase, during the end step, or, in some unusual cases, during the cleanup step. (2024-07-05)
If an effect adds additional combat phases to a turn and a creature with a boast ability attacks more than once during that turn, its boast ability can still be activated only once. (2024-07-05)
Putting a lore counter on a Saga will usually cause the next chapter ability to trigger. If it already has a number of lore counters on it equal to its final chapter number however, no abilities trigger. In particular, this doesn’t cause the final chapter ability to trigger again. (2024-07-05)