Activate only if there are four or more card types among cards in your graveyard
BT2-111 SEC Digimon Lv.6 Alternative Art Beelzemon Color Purple Cost 12 DP 11000 Digivolve Cost 1 Purple 4 from Lv.5 Form Mega Attribute Virus Type Demon Lord/Seven Great Demon Lords Card Text 1 [Effect] While you have 10 or more cards in your trash, your [Impmon] can digivolve into this card in your hand for a memory cost of 4, ignoring this card's digivolution requirements
I might be leaving some stuff out, but that's more or less my thought process regarding it
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Taeko, the Patient Avalanche Taeko, the Patient Avalanche has a great leaves the battlefield trigger that looks to far more than ninjutsu to grow and scry
However, theres an awful lot of creature cards in March of the Machine (and other sets, of course) which have two sides, as well as the aforementioned Battle cards