Reaver Titan

Protection from mana value 3 or less is the load-bearing line, and it is doing something protection rarely does: instead of naming a color or a card type, it draws a horizontal line across the mana curve and voids everything beneath it. Most removal a table reaches for lives in that band, so the shield does not just dodge a category of answer, it dodges the cheap tier of answers wholesale, forcing opponents to spend real mana or nothing at all. That is what buys the rest of the profile. A 10/10 that has to be crewed is a familiar Vehicle bargain (you supply the four power, it supplies the body and dodges sorcery-speed removal on the turns it sits idle), but the attack trigger is where the card stops being a beater and becomes a clock: five to each opponent every swing, independent of whether combat connects, independent of blockers. The body is the delivery mechanism; the damage is guaranteed. Stack those three pieces and the design intent is unusually legible: build a threat that is hard to kill on the cheap, hard to block profitably, and hard to ignore because it drains the whole table on autopilot. Crew 4 is the only real seam, and it is a deliberate one: the titan is inert until you commit creatures to it, the single tax the rest of the package never charges again.