If youre new to Commander or Magic in general, this guide should help you to choose your first deck or commander
However, the powers that be didn't print Merfolk for a long time because they had tails, and thus didn't make sense as a creature running around outside of their seas
Solphim, Mayhem Dominus or Torbran, Thane of Red Fell curve into it reasonably well
It gets some value out of its graveyard though, which both Locke Cole and Ultimecia, Time Sorceress do well
(6/6/2025) If an exiled card has in its mana cost, X is 0 for the purpose of determining its mana value.
If you spot an enemy Phantasmal Image on the battlefield that's copying some scary creature, you may get rid of it by targeting it with Duplicant's trigger