Pallimud

A creature whose power is borrowed from somebody else's board: it reads the number of tapped lands a chosen opponent controls, and because that reading is a static ability rather than an entry trigger, it never stops updating. Have the chosen player tap out to cast something and the beast swells in real time; once their lands untap on their following untap step, it deflates again. The only thing locked in at entry is the choice of opponent, and that choice uses "choose" rather than "target," which means it slides past hexproof and shroud entirely: the decision is about reading who is most likely to tap low, not about who you are legally allowed to point at. That continuous recalculation is what separates Pallimud from a snapshot creature: here the live tempo of the chosen player is the stat line, fluctuating turn to turn, sometimes mid-turn as lands tap and untap around removal and instant-speed plays. With its toughness fixed at 3, it never becomes a complete blank against an opponent sitting on open mana, but the power swing is real only when that player commits. This is the conditional-creature experiment early Magic ran often, a body built to read and punish a specific opposing tempo pattern rather than to perform on its own terms. The reward goes to whoever can force the chosen player to spend their mana while the beast is in play, since the swing is best on the turns they tap low and worst when they hold up answers.