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Once an Assassin creature or commander you control deals combat damage to a player in a turn, you can cast spells for their freerunning costs for the rest of that turn
Aurora, Dreaming Guardian is the ideal combo card, working with the rest of your Sapphire deck to keep that lore going up and your characters safe
Reinforce When I designed this mechanic in Morningtide , I pitched it as a cycling variant
Massacre Girl, Known Killer brings back wither, a mechanic Wizards of the Coast has been afraid to use, in case it makes +1/+1 counters confusing
Your store should provide lands, so just use theirs this way you dont get mixed up on which are yours and which are the stores