Tengu format ruling
Gateway of the Six

Card effect (current official text)Each time a "Six Samurai" monster(s) is Normal or Special Summoned, place 2 Bushido Counters on this card. You can remove Bushido Counters from your field to activate these effects.
● 2 Counters: Target 1 "Six Samurai" or "Shien" Effect Monster; that target gains 500 ATK until the end of this turn.
● 4 Counters: Add 1 "Six Samurai" monster from your Deck or GY to your hand.
● 6 Counters: Target 1 "Shien" Effect Monster in your GY; Special Summon that target.
Rulings
(1) Each time a Six Samurai monster is Normal or Special Summoned, place 2 Bushido Counters on this card. (2) You can remove Bushido Counters from your side of the field to apply the following effects. ● 2 Counters: Until the End Phase of this turn, 1 face-up Six Samurai or Shien Effect Monster gains 500 ATK. ● 4 Counters: Add 1 Six Samurai monster from your Deck or GY to your hand. ● 6 Counters: Special Summon 1 Shien Effect Monster from your GY.
- The (1) Continuous Effect places Bushido Counters without using the chain.
- This effect applies even if the Summoned Monster is flipped face-down / leaves the field.
- This effect does not apply if a Monster's Summon was negated (by Solemn Judgment).
- The (2) Ignition-like Effects start a chain. Declare which effect you are activating.
- Removing the corresponding number of Bushido Counters is a cost.
- Gateway of the Six must remain face-up on the field in order to resolve this effect.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.