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Training Groundsutility$6.83It performs a very similar cost-reduction role for activated abilities, and in many creature-heavy decks it functions as a stronger version by reducing activated abilities of creatures even further.Biomancer's Familiarutility$1.02This is another creature-ability cost reducer that helps power out activated abilities, especially in Simic or creature-based combo shells.Zirda, the Dawnwakerutility$2.52It reduces the activation cost of activated abilities across permanents, serving a broadly similar combo-enabling role to Heartstone.Jhoira's Familiarutility$1.51While it reduces the cost of historic spells rather than abilities, it fills a similar role as a generic cost-reduction artifact in combo-oriented decks.Grand Architectramp$1.08It indirectly discounts artifact activations and can enable mana acceleration for synergy decks, overlapping with Heartstone-style combo support.Rings of Brighthearthutility$4.55Instead of discounting activations, it amplifies them by copying abilities, making it a comparable activated-ability synergy piece.The Reaver Cleaverutility$9.53It supports activated-ability and mana-sinking game plans by generating extra Treasure, often serving as a higher-power utility piece in decks that want efficient activations.Goblin Welderutility$13.81It is not a cost reducer, but it is a classic activated-ability value engine in artifact decks and belongs in the same kind of synergy space.
