Bushido is a fine, simple mechanic, but I find it a bit lacking
We have seen power creep in most areas of magic (only really excluding mana acceleration), both ultimately over the whole existence of the game, and more consistently in recent history too
Things like Onakke Oathkeeper, Fog Bank, Wall of Denial, and Silent Arbiter will make it difficult for your opponents to attack and get creatures through
Its a bit slow, but you should be able to bargain something away in a pinch
C Common Nibiru, the Primal Being X LIGHT Level 11 [ RockEffect ] ATK 3000 DEF 600 During the Main Phase, if your opponent Normal or Special Summoned 5 or more monsters this turn (Quick Effect): You can Tribute as many face-up monsters on the field as possible, and if you do, Special Summon this card from your hand, then Special Summon 1 "Primal Being Token" (Rock/LIGHT/Level 11/ATK ?/DEF ?) to your opponent's field (this Token's ATK/DEF become the combined original ATK/DEF of the Tributed monsters)