surge of salvation
While using Abuelo's Awakening to summon Rakdos joins up as a creature and then copy it with Hulking Metamorph which would then result in damage to my opponent, they cast Surge of salvation which states "prevent all damage from black/red sources that would deal damage to creatures you control" but instead it prevented the damage effect of Rakdos joins up from activating at all, even thought it is unable to do any damage to creatures, which is not correct behavior according to card text.
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Meliodas#51845
shared this idea
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Rezzahan#77802 commented
"YOU and permanents you control GAIN HEXPROOF ...". And Rakdos Joins up TARGETS the opponent. So no legal target, no damage loop.