Instead, Solitude is currently the most expensive Evoke Elemental, which currently sells for $18
With Ivy, you generally build it as a very different Voltron-style deck, casting a bunch of enchantments and single-target spells and turning them into two-for-ones by making sure you target someone other than Ivy
The mechanic is hard to design, hard to develop, and was miserable to play against
However, if you've got a deck that draws a lot of cards, being able to cast spells by paying life instead of mana could be very helpful
Aggressive decks can expect to recur it as they will do damage to face with spells and or walkers
The impact of any one card in a commander deck is very hard to measure