Harkyl the Swift

Double Strike, Haste
Diviner's Portent—When Harkyl the Swift starts
in the command zone or returns to the command
zone, roll two d20 and save the results. Whenever
a player rolls a d20, you may change the result to
one of the results you saved.
Stunning Strike—{2}{u}{r}, {t}:Deal 3 damage to
target creature. Tap that creature if it has
toughness 4 or greater.