Needing to play a bunch of creatures, needing to wait until your upkeep, and needing to pay two life to draw the card all constrict the power of Call of the Ring just a bit, but for two mana, this can easily fit into all sorts of decks
Over time, this approach overwhelms defensive boards without relying on combos, which is why Aurelia often appears in discussions around top MTG cards for combat-focused Commander decks
Additionally, they seem to have a high volume considering they are a more nicher subset (500 sold a year on average)
Use your HS?Triumphant theme deck as the foundation, then add an awesome Yanmega Prime to make it even more powerful
MTG Arena may be a great way to fit more Magic: The Gathering matches into your life, but its in-game economy really is the pits
This can play well with scry effects and is also good for finding specific kinds of cards