Mondrak and helm of the host
When attaching helm of the host to mondrak glory dominus, the game fails to load all tokens made. In the game where I noticed the bug i had around 27 copies of mondrak and 200 treasure tokens. I cast finale of glory for x=200, however not only did it not spend the correct number of treasure tokens (it left me with over 150 despite having needed the whole 200 to cast the spell), but it also never made the angel tokens and only made 195 soldiers instead of 200.
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somsoc#29315 commented
Unfortunately for no real reason whatsoever, Arena is limited to producing 250 tokens TOTAL for each player. They implemented this with Scute swarm because they're unable to simply have a really big number appear in text and to batch all the triggers that might occur into a text box saying 'really big number of triggers' - they are actually trying to handle every single token individually when there's no reason a videogame should be doing this.
So yeah basically if you're a combo or johnny deck builder you're permanently limited from making the correct number of tokens appear when playing on Arena - which not only is a very sad deckbuilding/gameplay experience, but actually causes you to lose the game from time to time, too.