In this set, all of the Battles are Sieges, where you cast the card, its in play and you get an effect, then you choose an opponent to defend it
If you sacrifice Caetus while casting a noncreature spell (say, to activate a mana ability), the spell won't have convoke when you pay its costs unless it has convoke some other way
He's now ready to give you a basic overview of what Vintage is all about and how he maneuvered his deck around the old bear, so to speak
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You get to keep your blocker and wont take any damage unless the attacker has trample if you choose to block with River Boa and then regenerate it
Whether or not your opponent can utilize that information is going to vary game-to-game but its still something to be aware of