Just imagine an aggressive Winota, Joiner of Forces deck with Lurrus as a Companion, for example, or a Meren of Clan Nel Toth Reanimator deck with Gyruda, Doom of Depths tagging along for the ride
It can end games on its own without letting your opponents react to it if its kicker cost was paid
(Choose any number of permanents and/or players, then give each another counter of each kind already there.) Equip Whenever equipped creature deals combat damage to a player, put a +1/+1 counter on a creature you control, then proliferate
Its limited to finding instants and sorceries but does so at instant speed for just 1 mana, and sets your library up with exactly the card you need to draw for whatever your situation might be
Put 2 damage counters instead of 1 on the Defending Pokmon between turns
Lugia V Alt Art (Silver Tempest) 5