In EDH where artifacts and enchantments are the name of the game, Harmonic can devastate your opponents boards if you drop just a couple of slivers after it
For just a 2 mana and tap, you can draw and discard
Just the other week, I used Dire Fleet Daredevil to cast an opponents Surge to Victory, exiling my own Ephemerate in order to take infinite combats
This gives [c]Galvanic Relay[/c] a higher potential upside than [c]Act on Impulse[/c], as you can chain spells like [c]Pyretic Ritual[/c] and [c]Manamorphose[/c] to boost up your storm count, that way youll have plenty of cards to play for your next turn
It is at least nice to have the option of a reasonable blocker that is hard to shift out of the way when things get a bit rough
Nylea, God of the Hunt (Green Indestructible Creature) Another legendary God card but green this time, [c]Nylea, God of the Hunt[/c], costs four mana while being a 6/6 indestructible