The downside of this card is that you are already limited to special summoning only Melodious monsters the turn you activate this card, so you would most likely prioritize using Ostinato and use this Spell as a backup
Fourth, and although the list is much longer, you can catalogue a basic list of simple effects in Magic (like drawing cards, dealing direct damage, discard, creature boost, etc)
Table of Contents show Honorable Mention: Court of Ardenvale + Embereth + Garenbrig + Locthwain + Vantress Listed at: $4-$5 For Commander players, WotC created six new rares and two mythic rares that, although intended for EDH decks, are only found in Set and Collector boosters
If it turns out that red wants two cheap mass removal effects I think Pyroclasm is the better card to complement the Slagstorm for their differing costs
The largest failing of Paralyze in black historically is that it works very poorly with Edict effects
Lieutenants of the Guard is a 2/2 for that lets players vote to make it bigger or give you 1/1 Soldier tokens