Aryel, Knight of Windgrace Aryel, Knight of Windgraces token generation effect is a fair use of your mana, but it really shines as surprise removal in your knights deck
When dual lands are in play, this card will help you keep their power in check
To make it useful, you need a healthy number of creatures and the ability to regularly hit 3 mana on top of whatever you want to be casting that turn
Because card designs usually treat sacrificing as a cost rather than a payoff in itself, they are far less likely to include additional limitations on how often an ability can be used, and youre more likely to get valuable resources (mana, cards, other permanents) out of the exchange
Plus, if your opponent can deal with your Ixalans Bindings, you now have a way of returning them to your hand