Card of Sanctity is, objectively, the most broken of them all
If you need to stall the game before your opponent beats you to the shadow realm, you can simply activate Battle Fader, Special Summon it to the field, and end the Battle Phase
Black Pendant
This is especially relevant because the pure variant of Sky Strikers is often better suited to going 2nd due to the deck not really building a board
Deck can also have tags and while most are blurred out, the video highlights the possibility of finding Decks from YCS champions with this tag
As you can guess, as is the case with any popular collectible card game worth its salt, the challenge in Master Duel, aside from winning your matches, is assembling good decks with proper synergies