flavorText: Professor Onyx urged the twins to prepare for the dark mage Extus, sounding very much like someone familiar with the rise of tyrants.
name: Professor's Warning
printings: STX
text: Choose one —\n• Put a +1/+1 counter on target creature.\n• Target creature gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)