Both have their pros and cons, but Id ultimately choose the latter as its easier to spend mana on Castle Vantress than to rely on having a legendary creature on your side of the field to activate Rivendells ability
While you do have to play a two-mana 1/1 Flier to set all these free plays up, its worth it for the tempo you can recover when you do
Xathrid Necromancer $6 Onslaught block was a very long time ago, but I played a great deal of Standard back then
On the other hand, Captain Hook, Forceful Duelist would be pretty strong by Magic standards, and so would Stitch, Rock Star
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