2023-10-13 : "Partner with [name]" represents two abilities. 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."

2023-10-13 : For example, if you cast Rory Williams from your hand, the triggered ability will exile it and it will gain suspend. When you cast it from exile, it resolves normally.

2023-10-13 : If you somehow counter the ability that triggers when you cast Rory Williams, it will resolve normally and will not be exiled.

2023-10-13 : Note that the target player searches their library (which may be affected by effects such as that of Stranglehold) and that the card they find is revealed, even though these words aren't included in the ability's reminder text.

2023-10-13 : Rory will resolve normally if cast from exile for any reason, not only if it was cast with its suspend ability.

2023-10-13 : 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. If a legendary creature card with "partner with [name]" is designated as your commander, the named legendary creature card can also be designated as your commander.