Philadelphia Union already use an aggressive playing philosophy: They want to dominate the tempo of a match by controlling the ball and pressing the opponent to get it back. Ernst Tanner believes in fielding a young, energetic team, so 2019 is only going to get more exciting.
The system that is carrying Philly to the playoffs relies on playing a high back line that squeezes space and forces the other team to play into tight spaces. Then the Union close down the ball and quickly play it forward to release their wingmen, who are talented in one-on-one situations.