Captain Marvel, Earth's Protector Bug
I experienced a bug with Captain Marvel not being removed after having a minus toughness effect cause her to go below 0.
In game, opponent flashed in Captain Marvel to block an attacker and used the ability to give an indestructible counter. After damage was assigned she was down to 1 toughness.
In the second main, I cast a spell to give target creature -2, -2 until end of turn which should have gotten around the indestructible counter, however she remained on the battlefield and proceeded to run away with the game.
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Rezzahan#77802
commented
Damage to a creature does NOT reduce toughness. That damage is marked on the ctreature until removed by an effect or in the cleanup step. Marked damage is compared to the creature's toughness, and if that damage equals or exceeds the toughness, the creature is destroyed, IF the toughness is above 0. If the toughness is reduced to 0 or less, a different state based action puts the creature in the graveyard without destroying it. Hence why you can kill indestructible creatures by reducing toughness. But, you have to do that ALL THE WAY. Combining damage with toughness reduction will only result in a less tough indestructible creature with damage marked, that won't be destroyed.