Endurance Bobblehead

The Bobblehead subtype exists to reward accumulation, and this is the payoff piece that turns a shelf of novelty artifacts into an actual threat. Read the second ability closely: X counts the Bobbleheads you control at activation, so the pile of otherwise-inert collectibles you have been assembling becomes a scaling anthem that grants +1/+0 and indestructible to a crowd. On its own the card is an any-color mana source with a modest overload; two Bobbleheads and it starts covering a real board; five or six and a single activation walls off your own attack's blockers and pushes through a lethal alpha strike without losing anyone to blocks. The design choice worth noting is the sorcery-speed clamp on that pump. An indestructible-granting effect this wide would be a genuine blowout at instant speed, ambushing attackers or fizzling removal on the stack; restricting it to your own main phase keeps it proactive rather than a reactive trump, so you commit the mana on your turn, before combat, before the opponent has shown their hand. That timing restriction is the reason it never becomes a fog-adjacent panic button: it protects a team you choose to swing with, not a board you are scrambling to save. Everything else (any-color fixing on the mana ability, the power boost stapled to the protection so the buffed team also hits harder) is built to make a joke tribe worth counting.