The best way to take advantage of Threaten effects is to sacrifice the creature you steal so that you remove their creature while generating extra value
I played against Jadine Klomparens in round one and immediately realized how badly I was going to get destroyed when I didnt follow up with a turn 2 play against her Jeskai deck, and she proceeded to best me down with a Mantis Rider, while my Brimaz stared helplessly from the ground
Then, replace them with all ten shock lands, the five Ikoria triomes, and the new triomes from Streets of New Capenna
For example, if you put Null Profusion (an enchantment that says your maximum hand size is two) onto the battlefield and then put Venser's Journal onto the battlefield, you'll have no maximum hand size
If youre hoping to trade cards of 3-diamond rarity, 4-diamond rarity (ex cards), or 1-star rarity (full art cards), you will need Trade Stamina and Trade Tokens