Soulblade Renewer

• WWizards of the Coast2018-06-08
  Official Ruling
  If a spell with support has other abilities that target creatures, those abilities and the support ability can target the same creature.
• WWizards of the Coast2018-06-08
  Official Ruling
  If some, but not all, targets for a spell become illegal, the remaining targets are affected as appropriate. If all of a spell's targets become illegal, that spell doesn't resolve.
• WWizards of the Coast2018-06-08
  Official Ruling
  You can't put more than one +1/+1 counter on any one target using the support action.
• WWizards of the Coast2018-06-08
  Official Ruling
  "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 their library."
• WWizards of the Coast2018-06-08
  Official Ruling
  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.
• WWizards of the Coast2018-06-08
  Official Ruling
  A nonlegendary creature can't be your commander, even if it has a "partner with" ability.
• WWizards of the Coast2018-06-08
  Official Ruling
  Support can target a creature another player controls.

Rulings via Scryfall