Tunnel Tipster

A green mana dork whose growth is tied not to creatures in general but to the specific act of putting hidden bodies into play. The floor is dependable: a two-mana 1/1 that taps for green never embarrasses itself in a ramp shell, though like any creature without haste it sits through summoning sickness before that mana comes online. The end-step trigger is the reward, and its wording shapes the deck around it. It cares only that a face-down creature entered under your control this turn, not that the Tipster itself flipped or that any particular mechanic produced the disguise; the counter lands once per turn regardless of how many hidden creatures you dropped, which favors a steady climb over a burst. That single-fire ceiling is the restraint that keeps a self-growing mana source honest: it grows, but only as fast as you keep feeding it a new face-down body each turn. Structurally it belongs to the small line of dorks that reward a subtheme rather than simply fixing mana, the way certain elves count lands or spells, and here the subtheme is the whole cloak-and-dagger apparatus of morph, manifest, disguise, and cloak folded into one condition. Left alone it ramps and forgets to grow; inside a deck built to hide creatures, it quietly turns from a mana source into a threat while your attention is spent elsewhere.