Refugio 87: evolución forzada
Encantamiento — Saga
(En cuanto esta Saga entre y después de tu paso de robar, agrega un contador de sabiduría. Sacrifícala después de III.)
I — Gana el control de la criatura objetivo que no sea Mutante mientras controles el Refugio 87.
II — Pon un contador +1/+1 sobre la criatura objetivo que controlas. Se convierte en un Mutante además de sus otros tipos.
III — Roba una cantidad de cartas igual a la mayor fuerza entre los Mutantes que controlas.
The target of Vault 87's first chapter ability only needs to be a non-Mutant when that ability is put onto the stack and when that ability resolves. The control effect won't end if it later becomes a Mutant (perhaps because of the effect of the second chapter ability).
If Vault 87 leaves the battlefield before its first chapter ability resolves, you won't gain control of the target creature at all.
Use the greatest power among Mutants you control as Vault 87's last ability resolves to determine how many cards to draw.