Tainted Indulgence is actually pretty close to Chart a Course in power level on balance, but Chart a Course is great, and I rarely exclude it from my Cubes
You could leave in both of these instead, especially Embrace the Unknown, as it is a new card, but I like the opportunities the other two give
(It is every creature type.) Enchantment Color tag templates(None) Burgeoning Whenever an opponent plays a land, you may put a land card from your hand onto the battlefield
This is especially useful for attacking down the Battle and not falling too far behind on the crackback
Call to the Netherworld So your Big Game Hunter came into play, you used it to kill a large creature and then block, so its now in the graveyard
If multiple creatures deal combat damage to you or an opponent at the same time, the appropriate ability of Strixhaven Stadium will trigger that many times