Furina, Faux Archon

Furina, Faux Archon cannot attack or block.
Whenever a creature you control attacks you lose
1 life, that creature gains +1/+0 until end of turn.
Whenever you cast a spell you gain 1 life.
Whenever Furina, Faux Archon would be
destroyed you may pay 10 life. If you do, transform
it instead.