It can hit as a 4/3 hasty trampler by itself, but its better used to give, say, +3/+0 and haste to a bigger threat
To set out the game, place the paper playmat in the middle of the table , placing the Ursula card in the space in the middle
Bonus remark: You can play Kaheera, the Orphanguard in a Vadrok EDH deck, but not the other way around
But what makes Beseech the Mirror the best card in Wilds of Eldraine is that it not only tutors any card in your deck for a cost of four but that it puts that card directly onto the battlefield if the Bargain cost is paid
You have to rely a lot on drawing Kodama of the East Tree or another enabler and you don't have quite as much redundancy as you'd have in a deck with maybe a half dozen Walking Atlases and you can't use Murasa Rootgrazer basically at all, which is a shame, but you can still generate a ton of value in ways Blue decks can't
(Also paying the waifu tax, a real thing in Magic collecting.) All the cheaper copies got bought out in TCGPlayers last sale, the card is up $20 in the past couple of weeks, and by the end of this calendar year, this will have broken through $400 and be staring at $500