With the right mix in your deck, you'll be able to protect yourself and control the pace of the battlefield
Yes, there are a few Commander-specific cards that are available on Arena, but it's restricted to the pre-defined commanders themselves
They are naturally good against spot removal on their own, and Ajani allows you to make them large enough that you dont need to overcommit to the battlefield, which in turn makes them good against sweepers as well
Prices for these cards experienced a similar boom in 2020, a subsequent correction, and then a leveling off after the dip (with the exception of Blastoise, an outlier that seems to have spiked again very recently)
Terapagos has carved out a niche for itself by virtue of its rarity and the mystique surrounding its origins and powers
Attacking with Aurelia for the first time each turn lets you untap all your creatures, giving you an extra combat phase afterwards