Whenever one or more Scouts, Pirates, and/or Rogues you control deal combat damage to a player, exile the top card of that player's library. You may cast it. If you don't, create a Treasure token.
Whenever you cast a spell you don't own, put a +1/+1 counter on each Scout, Pirate, and Rogue you control.
Vaan turns combat damage from your Scouts, Pirates, and Rogues into theft engines—exiling top cards from opponents' libraries to cast yourself or convert into Treasure. You build a wide, evasive board of relevant creature types, swing in, cast the stolen cards for value, and snowball your team with +1/+1 counters every time you cast something you don't own.
Generates massive card and Treasure advantage off connecting even a single creature
Buffs your whole tribal board for free whenever you cast stolen spells, creating runaway boards
Lives in mono-red with abundant impulse-draw and tribal support, keeping the deck cheap and consistent
Treasure production fuels splashy stolen bombs you'd otherwise never cast in mono-red
Needs creatures to connect first, so it stalls against heavy blockers, fog effects, or board wipes
Mono-red lacks reliable interaction, card-type tutors, and recursion
Vaan is fragile and removal-prone; without him the engine evaporates
Stolen cards depend on opponents' decks, so payoffs can be inconsistent or off-color