Ok thank , i don't now thats , thats can be very usefull + karma , also i have another probleme , mutate a skeleton into a forest scorpion and the passiv skill (1 poison counter) is not apply , it is normal or a bug ?
When a creature is mutated, it first decides what creature it's going to be (forest scorpion), then it decides its attack/hp (whatever/whatever), then it decides the skill it has (devour, destroy, steal, scavenger, deja vu, even nothing). If a creature is mutated into, say, a pegasus, it's not guarenteed to get dive, but it might. It also might end up being a 0/8 with dive. It's just luck.
However, if you reverse time the mutated creature, the card you draw will be the actual version of the card, and will come into play as it would normally if it were in your deck. Useful if you mutate something into a nymph and would rather use the nymph's real ability.