These are some good statistics
Some examples from testing include using Kolaghan's Command, discarding my own Fiery Temper to burn for five for lethal, and swinging with everything except Kalastria Highborn, recurring a Bloodghast post-combat and saccing it to Liliana to deal the final two points of damage
Some of these effects already reward you for losing creatures in combat, which should be happening constantly
If you have a giant mana sink and ways to untap it, something easy to accomplish in a format like Commander, you can do this multiple times a turn and cast a ton of powerful, high-cost spells for free
They dont offer any specific bundles on the cycle of Moxen, or the entire Masterpiece Edition: Invocations set, but their price and quality are still fair choices
There are other options, sure, but these are the ones that generally strike me as the most impactful