Color war (edited): Mechanics

Ash Remnants: When this creature dies, create PARAM1ASWORDS Ash token(s). Used on 18 cards: Flaming Cheetah, Burnard, Clan Leader, Emberheart Core, Emberclan Archer, Emberclan Buster, Emberclan Crusher, Emberclan Elder, Emberclan Lancer, Emberclan Spellcaster, Emberclan Warpriest, Emberclan-Den Guard, Growing Elemental, Lava Wall, Emberclan Spellgorger, Stomping Firebear, Emberclan Sorcerer, Emberclan-Warrior, Emberclan Outcast

Bloodlust: This creature gets +PARAM1/+1 as long as a creature died since the beginning of your last turn. Used on 9 cards: Nero, Patrol Leader, Slashnose, Scarred by the War, Robotic Mimic, Paw-Tribe Archer, Featherscreech Engulfor, Paw-Tribe Plating, Paw-Tribe Warrior, Slashing Bear, Stomping Firebear

Delve: Each card you exile from your graveyard while casting this spell pays for {1}

. Used on 4 cards: Paw-Tribe Mystic, Sporefog, Earthquake Hydra, Bane of the Darkwood

Simply a shortcut

Slam: Whenever ~ deals combat damage to a creature, tap that creature and put PARAM1 stun counter(s) on it. Used on 8 cards: Slashnose, Scarred by the War, Robotic Mimic, Battle Reserves, Paw-Tribe Banner, Paw-Tribe Stomper, Well of Strength, Rumbling Reinforcer, Ka`dr’an, Goldback

Then put \1 Drunk counters on that creature: If a creature with drunk counters on it attacks or block, sacrifice it at end of combat. At the beginning of each players end step, remove a drunk counter from it. Used on 7 cards: Featherwatch Mead, Squeak-Gang Alcoholic, Pawleaf Gin, Barnacle Wine, Squeak-Gang Bar, Squeak-Gang Leathers, Blue Flare Brew

Swarm: Whenever this creature attacks with at least one other creature that shares a creature type with it, create PARAM1ASWORDS tapped and attacking 1/1 blue fish creature tokens. Used on 8 cards: Nautical Findrone, Robotic Mimic, Glisterfin Banner, Glisterfin Garrison Leader, Glisterfin Warrior, Nirada, Shining Fish, Swarm Leader, Library Sorcerer

Training: Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature. Used on 1 cards: Glisterfin Apprentice

This mechanic already exists (see Crimson Vow)

Flame Body: When this creature blocks, it deals PARAM1 damage to each creature it is blocking. Used on 19 cards: Burnard, Clan Leader, Navan, Embercore Pitlord, Robotic Mimic, Battle Reserves, Dissolve, Entwined Fireshot, Emberclan Archer, Emberclan Spellcaster, Emberclan-Den Guard, Emberclan-Member, Lava Plume, Lava Wall, Multiplying Elemental, Eternal Flames, Elemental, Emberclan Sorcerer, Emberclan-Warrior, Blue Flare Brew, Emberclan Outcast

bushido

Swift Swim: When ~ attacks, you may tap PARAM1ASWORDS untapped Islands you control. ~ gets +PARAM1/+PARAM1 until end of turn. At the beginning of your next Main Phase, untap half of the lands tapped this way, rounded down. Used on 9 cards: Fish, Parliament Polka, Glisterfin Apprentice, Glisterfin Warrior, Lumindra Neon-Scales, Protective Bubble, Scales of Reinforcement, Swarm the Enemy, Keeper of the Trench

Just weird Bushido

Dance: Tap any number of creatures you control with total power PARAM1ASWORDS to dance this dance. Dance only as a Sorcery. Activate only once each turn. Used on 4 cards: Fiery Tango, Featherwalz, Squeaky Pole-Dance, Parliament Polka

In card text or details pages, write the mechanic's code name (playtest name) between square brackets, like "[Crittercast]", "[Bushido 1]" or "[Delay 4 {2}{R}{R}]". It will be expanded to the mechanic's name plus reminder text, such as "Suspend 4 – {2} {r} {r} . (Rather than cast this spell from your hand,...)"
To expand a mechanic's name but not its reminder text, include parentheses at the end of the square brackets: "[Crittercast()]", "[Delay 9 {R}()]".