Cyclopean Giant

The death trigger is the whole pitch: trade the body away and you stamp a Swamp onto any land you point at, rewriting its types so it loses the abilities and colors it used to produce. The land stays on the battlefield, just producing the wrong mana now (a nonbasic that becomes a Swamp is still a nonbasic, it simply taps for black instead of whatever its old type granted). This is land disruption disguised as a beater, a strain of color-screw aggression black has flirted with in eras when Strip Mine and its descendants were too good to print straight. The 4/2 frame is calibrated for the exchange: a power-four attacker that wants to trade or be blocked, because dying is when it does its real work. The self-exile on death is what keeps the effect from becoming a grindable engine; you get one Swamp-stamp and the card is gone, no recursion loop to abuse, no one-sided land tax slowly choking a game out. The function ages well against any manabase leaning on nonbasic colors, since stripping a land's type is far harder to play around than destroying it outright: the mana is still there, just the wrong mana. Modest curve filler whose appeal lives entirely in that exchange, not in the swing.