Oklahoma City Thunder guard Shai Gilgeous-Alexander (2) moves the ball against Los Angeles Lakers. The NBA playoffs continue on Saturday, with two Game 4s on the horizon. If you are looking to make a few DFS plays, you can sign up with the   Underdog promo code NYPOST  to access the Play $5, Get $50 in Fantasy Bonus Entries offer .  James Harden and the Cavs host the Pistons at 3 p.m. ET on NBC/Peacock. In the primetime slot, LeBron James and the Lakers welcome Shai Gilgeous-Alexander’s Thunder into town at 8:30 p.m. ET on ABC. Underdog promo code NYPOST for the NBA Playoffs First-time fantasy users who sign up with the Underdog promo code NYPOST are eligible for a substantial welcome offer: Play $5 and receive $50 in fantasy bonus entries . DFS is one of many ways new users can put their fandom to use and earn compensation by making the right picks.…