The single biggest driver of variance is whether Akari Pikachu specifically appears in the box
Blue-Eyes Ultimate Spirit Dragon: A Level 12 Synchro that negates effects, increases ATK, safeguards your Graveyard, and can bring back a LIGHT Dragon from the Graveyard
It's ability also means that, in combination with a powerful creature, Sylvan Safekeeper can help insulate key pieces from removal
Likewise, if youre going to make a Control deck, then youll probably want to use Blue
It's one of the only cards thatll actually turn your near-infinite life into a victory, rather than just a long, drawn out game where no one can actually bring you within striking distance
NAZGUL BATTLE-MACE Nazgul Battle-Mace is pretty expensive if you evaluate it purely on the abilities it grants, but its costed this way because stealing opponents sacrificed permanents is very strong