He'll keep that up all game, while you get on with playing your win conditions and your opponent tears their hair out
During your next turn, this Pokemon can't use attacks.
If you do, put this card into your hand as it resolves.) Tap target artifact, creature, or land
And since the Clone is a legendary Deadpool, after you've had your Clone Deadpool exchange its text box with a creature, the legend rule will apply and will make you get rid of one of the Deadpools
So unless I missed something else in my admittedly quick and simple search, I'm going to stand by my statement
Why Buying Singles Beats Blind Boosters (But Opens Are Still Fun) Financially, buying singles from sellers like us guarantees you'll get the exact card you need at a fixed price, avoiding duplicate chaff and wasted pence