Cyberstrike cobra

You may pay 2 life instead of paying Cyberstrike cobras mana cost.
when Cyberstrike cobra enters the battlefield
return target creature from a graveyard to the battlefield under your control.
Once per turn you may chose a target creature
and a number, the targeted creatures mana value becomes the chosen number.when a creature you control is used for s synchro summon, return it
to the battlefield.