Magic: The Gathering: 10 Most Powerful Mono-Blue Cards In 2020 Standard

You're playing against a deck that uses blue and you've managed to have your big threat get through all of their counterspells and hit the battlefield. Just to have your opponent untap and immediately steal your hard earned threat and punish you with it. Those are the kind of plays you can make when you play with Agent if Treachery.

Normally five mana of any colour plus a further two blue for a 2/3 creature is overpaying to the enth degree. What makes this 2/3 stand out is that when it enters the battlefield you gain control of target permanent. Not until end of turn, not as long as you control Agent of Treachery, it's just yours now. When paired with cards like Thassa, Deep-Dwelling that blink a creature Agent's second ability can also come into play. At the end of your turn, if you control three things that aren't yours, you win the game. In most cases your opponent will be conceding long before this happens.

Seeing play in Temur decks that can quickly get up to seven mana Agent can often induce concessions from your opponent as soon as it hits the battlefield. When a card can do that it's time to sit up and pay attention.