The power of the other creature is checked only when it blocks or becomes blocked by Arrogant Bloodlord. Once the Bloodlord's ability triggers, it will be destroyed at end of combat (after combat damage has been dealt) even if the other creature's power changes before then.
2010-06-15
wotc
If Arrogant Bloodlord blocks or becomes blocked by a creature whose power is 2 or greater, Arrogant Bloodlord's ability won't trigger. It still won't trigger if the other creature's power changes to 1 or less later in combat.
2010-06-15
wotc
If Arrogant Bloodlord becomes blocked by multiple creatures with power 1 or less, its ability triggers that many times. Each of those abilities will cause it to be destroyed separately (in case Arrogant Bloodlord isn't destroyed the first time due to an Aura with umbra armor, for example). The same is true if it somehow blocks multiple creatures with power 1 or less.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Not Legal
Modern
Legal
Legacy
Legal
Pauper
Not Legal
Vintage
Legal
Penny
Not Legal
Commander
Legal
Oathbreaker
Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Legal
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