They're all reasonably inexpensive, but a single Swords to Plowshares can exile one of your key players, leaving you unable to assemble all the Elements of Harmony
Every time a nontoken artifact enters, you create a 2/2 creature
FromTheShire: This stupid thing is probably going to be $100 in a few years because people love this effect and it's going to be forever to get reprinted, if ever, with this extremely specific name that can't go in normal sets
Because we will then cast them as a creature from the exile zone , this does not increase Commander Tax
Ragnarok, Divine Deliverance Rarity: Uncommon TYPE: Legendary Creature SUBTYPE: Beast Avatar CMC: 7 Mana cost: USD: $0.00 EUR: 0.00 TIX: 0.00 EDHREC RANK: - (7/6) Vigilance, menace, trample, reach, haste When Ragnarok dies, destroy target permanent and return target nonlegendary permanent card from your graveyard to the battlefield
The second ability wont come up much in Commander, as it involves discarding Orvar and thats something you dont want to do