Make seals strikes that generate Holy Power and give temporary buffs (20-30s) in the form of seals, all seals can be active on the paladin at once, but should rarely be optimal to do so. Judging consumes all active seals to deal damage based on number/type of seals active (starts low) and apply short duration (20-30s)debuffs.
Crusader Strike: Deals ST damage.
Buff: Seal of the Crusader: Grants X% haste.
Judgment debuff: Increased holy damage.
Righteous Strike: Deals AoE damage.
Buff: Seal of Righteousness: All attacks deal additional Holy damage to the target and all nearby enemies.
Judgment debuff: X% of all damage dealt to target radiates to nearby enemies.
Vengeful/True Strike: ST damage, half instant, half DoT. Multiple hits accumulate increased damage (same mechanic as Warrior's Trauma talent).
Buff: Seal of Vengeance/Truth: all attacks deal an additional X% over 6-8 seconds, multiple hits accumulate increased damage, DoT from seal and strike are the same debuff.
Judgment: Consumes all vengeance on the target to deal 130% (or whatever % is deemed balanced) of accumulated damage immediately, added to Judgment's damage.
Insightful Strike: Strike does half ST damage half HoT.
Buff: Seal of Insight: All attacks heal you for X% of damage delt over 6-8 seconds, multiple hits accumulate increased healing, HoT from Strike and seal are the same buff.
Judgment debuff: All attacks against the target heal the attacker for X% of max HP/restore X% of max mana (short internal cooldown per player to make it reasonable).
Strikes ideally have no coodown, or share a very short cooldown (3 seconds) with 2 charges.
Judgment has a low CD, 5sec maybe, does low enough damage to be not worth casting if you have no seals unless you are out of range, but does substantially more damage for each seal you have active. Judgment consumes all active seals.
Judgment does not have a Holy Power cost. Judgment should only be top priority in the rotation when debuffs need to be applied/refreshed, otherwise spending Holy Power should be top priority (Priority would look like:: Judge to refresh/apply debuffs > Spend Holy Power(TV or DS) > Judge for damage with 2+ seals > Build Holy Power(Strikes/BoJ) > Judge for damage if out of range regardless of seals). If spending Holy Power and unleashing seals with Judgment were both on the same button it would be too shallow, shallow is bad.
So we're not just casting a seal, which has no noticeable initial effect, the seals themselves are holy power builders, taking the place of our current Crusader Strike in the rotation... It would flow much better than just casting a buff that is on the GCD, that you have to find time to weave into your builder rotation... They would just be part of your builders.
This could be a way to bring Seals, which were once a core part of Paladins and a big part of our visual aesthetic (so much so that they were even featured in the TBC cinematic), back into the game in a fun and engaging manner.
If you enjoy this idea, or think it would be fun, support it here.