Whenever you attack, you may pay . When you do, put two +1/+1 counters and a flying counter on target attacking creature. It becomes an Angel in addition to its other types.
Legal in
Modern, Legacy, Vintage, Commander
Rulings (11)
If a spell or ability with one or more targets states that you "may pay" some amount of , and each permanent that it targets has become an illegal target, the spell or ability won't resolve. You can't pay any even if you want to.
2024-06-07
The type-changing effect of the reflexive triggered ability lasts indefinitely. It doesn't wear off during the cleanup step or when Guide of Souls leaves the battlefield.
2024-06-07
Some triggered abilities state that you "may pay" a certain amount of . You can't pay that amount multiple times to multiply the effect. You simply choose whether or not to pay that amount of as the ability resolves.
2024-06-07
If an effect says you get one or more , you get that many energy counters. To pay one or more , you lose that many energy counters. You can't pay more energy counters than you have. Any effects that interact with counters a player gets, has, or loses can interact with energy counters.
2024-06-07