Sol Rings are easy to come by buy usually maintain a price of around $2-3 Cheaper cards like Worn Powerstone ($0.50) and Palladium Myr ($0.50) do a fine impression, though theyre obviously slower and more balanced
In the case of Demanding Dragon though, unless they have a creature they have no use for, the choice will likely be difficult
The other big-value red card is Bloodthirsty Adversary , a mythic rare Vampire that also belongs to the multikicker cycle, valued at $6.99 due to its ability to cast instants and sorceries from the graveyard for value
2 Oko, Thief Of Crowns Elks Everywhere Oko, Thief Of Crowns is one of, if not the best planeswalker ever printed, so much so that it's banned in every constructed format except Vintage and now Timeless
How well the card fits into Limited play