Strength Bobblehead

The payoff is written to scale with itself: each activation puts one counter per Bobblehead you control, so a lineup of otherwise unrelated artifacts starts counting one another into a self-referential engine. That is the whole conceit of the Bobblehead subtype. Individually each is an any-color mana source sitting under an artifact type line; collectively they inflate each other's sorcery-speed pump. The deck-building tension is between running enough copies to make that count matter and not clogging your curve with rocks whose real ceiling only arrives once the pile is deep. This one is the raw stat node in that family, the piece that converts accumulated Bobbleheads into board presence rather than cards or life or reach. Restricting the pump to sorcery speed keeps the counter dump from becoming a combat-step blowout: no end-step ambush, just a main-phase investment you commit before combat rather than at instant speed. Its structural cousins are the "count your permanents of a type" payoffs that reward a critical mass built quietly over several turns; the wrinkle here is that the type being counted is one the card itself belongs to, so it never counts zero. Even a lone copy can fix a color and, in a pinch, drop a single counter on a creature: a modest floor that grows steeper with every sibling you resolve. Alone it is durdly ramp with a small kicker; assembled with the rest, it is the reason the subtype exists.