Vibranium Mining Mech

Most colorless mana rocks pour resources into a pool you can spend anywhere; this one accrues a treasury that only ever points back at itself. The Vibranium tokens it mints are indestructible artifact mana barred from any nonartifact spell, a deliberate leash: the ramp exists to feed more artifacts, never to bleed into blue tempo or a mono-black drain engine sitting alongside it. That restriction is what lets the Vehicle spit out a fresh token on every enter or attack without becoming a colorless Cabal Coffers with legs. A 6/6 trampler is a fair rate to crew for two, and the pump gives a clogged board an incremental clock, but the real design lives in the loop between body and tokens. Because the token comes off the attack trigger rather than combat damage, the engine fires even when the swing is chump-blocked or fizzles, and each attack step stacks another indestructible source. The more it attacks, the deeper the artifact-mana pile grows, and the deeper that pile grows, the faster your other artifacts come online to crew and pump it further. Trample keeps the body threatening against a lone blocker, but it is the timing of the trigger, not damage, that guarantees the treasury keeps compounding. Take away the self-referential mana clause and this becomes a repeatable ramp source too dangerous to print; the clause is precisely what makes it worthless to anyone not already committed to the artifact plan.