The monsters serve as generic Flip Monster support, including various effects to Special Summon, Set, and/or flip face-up and/or face-down Flip Monsters (including themselves)
C Common Meltiel, Sage of the Sky X LIGHT Level 4 [ FairyEffect ] ATK 1600 DEF 1200 Each time a Counter Trap Card is activated, immediately after it resolves, gain 1000 LP, and if you do, if "The Sanctuary in the Sky" is on the field, destroy 1 card your opponent controls
Sea Lancer could also destroy one of the equipped monsters from himself to protect himself from destruction, which could trigger Dupe Frog to search for a Frog or Poison Draw Frog to let you draw a card
Tying everything together is the concept of racing as we commonly use it in Magic parlance: the idea that both life totals are steadily ticking down, and your best hope is to focus on making sure theirs goes down faster