It can notably copy the trigger from Sanctum of Fruitful Harvest since it doesnt count as a mana ability, its a triggered ability that makes mana
Potential Infinites There are a few infinite loops in here to generate all the landfall we could ever need - the Temur Charger can be turned face up at the cost of revealing a green card from hand, so anything that costs 1 to sacrifice it can be looped by paying the 1 and sacrificing it, returning it as a land, tap for 1 green, morph for 0 mana, then paying the 1 and sacrificing it, ad infinitum
Being indestructible makes this legendary artifact hard to deal with ensure that it tops this list
Songs tend to have especially powerful effects and, unlike normal actions, you can play them for free by having one of your characters exert to sing the Song instead
Then, attach the Energy card you reserved, and everything will be done
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