The deck didn't need the combo to win at all but was fun when it happened and always surprised my opponents

The mechanics include: Transforming Double-Faced Cards - cards that can transform into a different card Disturb - Cards that can be cast from a graveyard that transform into a different card Meld - Combine two cards into one more powerful card Emerge - Sacrifice a creature to reduce the casting cost of the Emerge creature Madness - Cast the card for its Madness cost when the card is discarded Escalate - A modal spell where you can pay extra for each mode beyond the first Flashback - Cast the spell from your graveyard for its Flashback cost Investigate - Create Clue tokens to draw a card Blood tokens - Create Blood tokens to discard a card, then draw a card Undying - Return the creature to the battlefield with a +1/+1 counter Miracle - Cast the card for its Miracle cost if it was the first card drawn this turn Soulbond - Pair two creatures together for additional abilities Thats a lot, and on top of all those mechanics, there are multiple versions of the transforming double-faced cards

An example would be the interaction between Froslass Ability Freezing Shroud and Garganacls Ability Blessed Salt where damage counters are removed and added
Within this group, the Jolteon and Eevee SARs tend to be the most affordable , while Leafeon, Glaceon, Vaporeon, and Flareon generally land in the middle of the pack
Arena Grand Melee A small collector's set released to supplement the Arena theme
All of those are solid additions