But something is still better than nothing
The most popular archetype in Pioneer, Rakdos Midrange, often runs a couple, where they have potential to combo nicely with Unstoppable Slasher, Reflection of Kikki-Jikki, or the deck's giant demon tokens
Dualcaster Mage can be used to copy any instant or sorcery spell when it enters the battlefield
These are effects that pretty much show up in every set in common in a particular color: White White always has some kind of lifegain, enchantment removal, and creature removal (which can include Blue Blue always has a counterspell (often two, one hard, one soft), "bounce" ("return BLAH to its owner's hand"), card drawing, creature-control enchantment (most often locking it down), and sometimes has a card sifting, shrinking ("target creature gets N/-0 until end of turn"), or twiddling ("tap or untap target BLAH")
You may choose a second target for it to destroy as well
Many can be proactive or reactive based on your needs Lightning Helix can be sent at the opponent's face, or it can be removal for a pesky planeswalker or creature