Creatures always die, and this can generate large amounts of mana consistently and quickly
Well, the creatures in play keep all of the +1/+1 counters, so while they might have started off as one mana 1/1s, theyre now probably 6/6s
Im not gonna lie I really like this card
A solid card for Atraxa, Praetors' Voice superfriends decks (oh wait are you allowed to play her still they killed her off with a building off-screen lol) since proliferate will keep triggering up your beacon

Each Collector Booster will have the following contents: Collector Booster Info 4 Foil commons, common dual lands, or basic lands 2 Foil uncommons 1 Foil showcase basic land 1 Extended-art rare or mythic rare (45 rares, 8 mythic rares) 2 Foil rares or mythic rares, or foil extended-art rares or mythic rares 2 Showcase commons or uncommons, or a borderless card being previewed by Martin Juza on June 8 (5 commons, 6 uncommons) 1 Showcase or borderless rare or mythic rare (8 rares, 17 mythic rares including 5 versions of mythic rare Teferi) 1 Foil showcase common or uncommon, or a borderless card being previewed by Martin Juza on June 8 (5 commons, 6 uncommons) 1 Foil showcase or borderless card, any rarity (5 commons, 6 uncommons, 8 rares, 17 mythic rares including 5 versions of mythic rare Teferi) 1 Foil token In a pack of a Core Set 2021 Collector Booster, you are always getting a minimum of four rares or mythic rares, and about 45% of the time, you will get five
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I think maybe the Mother of Runes are unneeded here, perhaps swapped for Withered Wretch if the mana base can handle it