The first is a triggered ability: "When this permanent enters the battlefield, target player may search their library for a card named [name], reveal it, put it into their hand, then shuffle." The second ability represented by the "partner with [name]" keyword modifies the rules for deck construction in the Commander variant and has no function outside of that variant
(2020-01-24) In a two-player game, if both players control an Athreos when a creature with a coin counter on it dies, the nonactive player (the one whose turn it isn't) will return the creature under their control
Etrata, Deadly Fugitive gives you access to more face-down creatures by cloaking cards from the top of your opponents decks and lets you turn them face-up more easily
You can rest that Character and use Sanjis Rush attack to KO it or at least force Counter cards from the opponents hand
Many of these kaiju were spin-offs of existing monsters in pop culture, such as Godzilla
Until next time, respect your elders, stay safe and stay healthy