Nanami

When Nanami becomes blocked, you may pay {2}. If you do, Nanami gains Deathtouch and
Split second strike until end of turn. (This
creature deals combat damage before creatures
with or without first strike.)
If you would begin an extra turn or an additional combat phase, pay {2} then Nanami gains +2/+2
until end of turn. If you don't, tap Nanami.