Blood on the Snow literally breaking game rules/mechanics
I was playing vs player "RedKettle" in Historic Brawl.
OP cast Blood on the Snow with X=4. At time of cast there are no 4 or less CMC creatures in their graveyard. OP has Gisa, Glorious Resurrector in play. While waiting for the spell to resolve, OP times out completely. The result was as follows:
No creatures were destroyed.
OP gained a SECOND copy of Gisa and ignored the Legend Rule.
The two Noxious Gearhulks that I had on my side of the field (gained from Blue Sun's Twilight on my previous turn) retained Summoning Sickness indefinitely and my Rielle, the Everwise did not untap.
These results clearly break how the game is intended to play out.
I am not sure if this was purely a visual bug, but I was given the option to block with the gearhulks when attacked by OP's 2nd copy of Gisa. (In hindsight I should have tried, but alas).