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whenever a permanent you control is put into the graveyard, you get one of these energy counters

the "rocks" differ in shape from type to type

It gets even better though: the card draw triggers off not just casting creatures (Beast Whisperer) but any time a nontoken creature enters the battlefield, so Blink decks (Roon of the Hidden Realm) will have a great time, as will any deck that can cheat creatures into play (Gishath, Sun's Avatar)

That doesnt seem like a big hurdle, but it seems more likely that Francisco will be played as a combo enabler than an aggro beater

Late-game, its another mana sink

Agathas Soul Cauldron is absolutely terrifying when used with Loot