These decks all play plenty of creatures with 4+ power, meaning that second ability will be getting plenty of use
While it doesnt have any triggers when dealing combat damage to a player (unlike other swords such as Sword of Fire and Ice), The Masamune supplies an additional benefit: If a creature dying causes a triggered ability of this creature or an emblem you own to trigger, that ability triggers an additional time. That was rather wordy, so its worth noting a few things: The Masamune must be equipped onto a creature for it to be in effect
As part of the late EX era, Holon Phantoms introduced this shiny Pikachu with a special "Gold Star" designation, making it a standout among Pokmon cards of its time
Nausea never looked so potent
Part Birds of Paradise, part Scavenging Ooze, part Grim Lavamancer, the Shaman was banned in Modern and Legacy but never broke into Standard or Pioneer, although a critical mass of pseudo-fetchlands will eventually push it into playability
Instead of running three card combos, maybe make sure your combos involve four cards, with none of them being your Commander