Riggs, Reticent Blade

Reincarnation-When Riggs enters the
battlefield, you may sacrifice {x} spirit tokens. If you do, Riggs costs {x} less to cast.
First strike, Deathtouch, Reach
Boast—{r}: Choose up to two target creatures to block Riggs, Reticent Blade.
If blocked by a creature with power 6 or greater this way, destroy Riggs.
If Riggs, Reticent Blade is in your graveyard, return to your battlefield transformed at the
beginning of your end step.