What we have here is a machine that want to suspend and destroy.
Going first is recommended.
opening moves:
Playing Jerry for Blue Leomon is key. Blue Leomon can only be played not digivoled into. Having a 3 in the bredding zone and play either Mimi is a good start. The luck of the draw relys on and early control of the board by deleting anything they on play on their turn 1 either but attacking with Leomon OR haveing and early Lilimon ACE for removal.
Strategy:
Stack up as many Blue Leomons and let you oppoment his security when they can IF ou have 2+ card in it. that GPC and GDS in Security hurts plus you may get some free tamers out of it.
Also its a rave to either SaberLeomon add some hurt or Rosemon to stun. I choose the ladder ro reap the memory form tamers.
DUE NOTE
If you have multiple SaberLeomons on the field, their End of Turn effects CANNOT all active. ONLY 1. There's a timing issue that occors. Read the Q&A for Blast ACE on the TCG website...... aaaaaalso it End of Turn effect needs the SaberLeomon to be unsuspended. Goes with out saying but I feel like some card just do what they want...
https://world.digimoncard.com/rule/pdf/booster_blast_ace_BT14.pdf