Evil Eye of Urborg

The drawback is the whole conceit: a 6/3 body big enough to threaten a real chunk of life total, leashed to a creature type almost nothing else shares. Field this and your other creatures are pinned to the ground; the Eye stares forward alone, and anything that steps in front of it dies before damage. That second clause is what turns the stat line into a riddle. A 6/3 trades down to almost anything in a straight block, so opponents would happily chump it to death, except chumping just feeds a creature to the destroy trigger and lets the six through next turn. The defender is caught between taking six and handing over a blocker, the kind of forced-bad-decision design that the unblockable-style finishers of the era kept circling. What you give up in return is teamwork: building toward the Eye means accepting that your board stops attacking the moment it lands, so the card wants to be the plan rather than a piece of one. It is a deliberately lonely threat, a beater that punishes interaction with it specifically while taxing you for the privilege of running it. The Eye creature type is the joke and the lock at once: a tribe of one, by design, so the attack restriction reads as nearly total unless you go out of your way to assemble more eyes.