Oh, hello there, cornerstone of every Flicker deck from now on , how have you been
When this creature becomes buffed enough with other instants, sorceries, artifact equipment, or enchantments, you can eventually cast Fight to destroy the problem creature before it has a chance to attack you again
Leaving the deck as is to maintain the theme isn't such a bad thing, but if you want the deck to pack a bit more punch, this is a route you can take
Sephiroth gives you the latter two out of the command zone, being a Blood Artist that can also cash your creatures in for cards
Not only does this cost 1 mana less than its counterparts in Chandra's Ignition and Waltz of Rage, but you can also cast it a second time while refreshing your hand
It doesnt hurt that you cant play these cards because its unplayable anyway