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But that's not the reason why this card got so expensive early on

Promo Info BOOSTER TIME STRANGER [BT-24] CLOSECLOSE BT24-091 U Option Tidal Stream Color Blue Form - Attribute - Type TS DP - Cost 5 Digivolve Cost 1 - Digivolve Cost 2 - Upper Text While you have a [TS] trait Digimon or Tamer on the field, you can ignore this card's color requirements

3 in Revised Core Set) Mandy is minimally playable, but this is further gimped by how Research Librarian's full deck search will immediately get canceled by Shocking Discovery

Its also interesting to note that Tifa itself can deal 7 combat damage due to melee if you attack each other player (Cadric, Soul Kindler plus myriad, anyone?)

With this archetype, you want to play Eldlich as early as possible and use the rest of your traps and summons to control the board