Beastmaster's Magemark

The reward structure here points sideways, not up. Most combat-oriented Auras pour their value into a single body: pump it, key it, hope it connects. This one anchors the buff to the act of enchanting rather than the creature it sits on, so a wide board wearing multiple Auras turns into a team of +1/+1 bodies on the strength of one Magemark. The blocked trigger is the sharper half: an enchanted attacker that gets gang-blocked grows by +1/+1 for each blocker, punishing the defender's natural response to a wide attack and flipping a profitable multi-block into a catastrophe. Note the asymmetry baked into that clause: "becomes blocked" only fires when you are the one attacking, so this is an offensive engine that rewards swinging into a wall of defenders, not a tax on the opponent's attacks. It is a design built for an enchantment-creature deck that treats Auras as a critical mass to assemble rather than single bombs to protect, where the second and third Aura cost almost nothing because the board is already committed. That dependency is also the limit: cast it on a lone creature with no other enchantments in play and you have a +1/+1 anthem of one, plus a combat bonus that does nothing until you attack into a blocker. The card wants company on your side of the board and a defender unwise enough to gang up. Built for the Aura-tribal shell, ignored everywhere the deck doesn't exist.