Playing a white black deck with Ajania OPutlander Chaperone. I used the ability to look at the top X amount of cards where x is my life total and put any with mana value 3 or less on the battlefield (26 cards looked at, 13 placed).

Some of these cards triggered life gain when entering, others created token on life gain or 1/1 cat tokens. The arena was looping around a few times then the warning started. I had no option but to keep resolving and then it drew the game.