Secondly she generates an army of flying tokens that will be able to swarm past any would be blockers capable of holding of Oona herself and lastly she will mill their library to nothing in fairly short order allowing her and all her minions to hold back and defend if needed while still working towards a win
So play a spell like Unburial Rites, and return your best dead creature right back onto play
If you deal combat damage with this creature, you have a chance to get a massive hoard of Treasure tokens
MtG has large fluctuations in how much each card can be worth
Its a free discard outlet as well, and there are lots of exploitable synergies with madness, discard, delirium, reanimator, and the like
Against aggro Aggro is going to be your most challenging matchup