Spell Targeting Bug
I had 2 red creatures: 1/1 on left, and 2/3 reach on right.
Opponent attacked with 4/4 flyer.
I blocked with 2/3 reach (on the right) and before damage cast "friendly rivalry" to make my 2/3 deal another 2 damage to the attacking flier, so that the remaining 2 combat damage would kill it.
Once the "friendly rivalry" spell resolved, I noticed that it instead selected my 1/1 to deal the damage and the my creatures were suddenly in a different order with my 2/3 now being on the left.
I is possible that I was the one incorrectly selecting the 1/1, but this is to be expected if the 2 red cards are similar and the game suddenly changes the order of my creature for no reason , leading to the miss-click, to the game loss and to the tournament loss.
PS: I know that the when there I select multiple blockers to an attacker, the game will re-organize the blockers to illustrate the order in which my opponent chose to assign damage: this was not the case as there was only 1 single blocker selected and no reason for the game to suddenly shift my creatures around.
This bug should be fixed to avoid similar user issues and unwanted plays