Each meld pair consists of two cards (normally creatures, but it has also been seen on lands) that, when certain conditions are met, can be flipped and combined to form a new card with combined attributes and abilities
The first two are well-established Commander staples, while Hammer still sees play in its namesake deck in Modern
Providing they stay flat, of course
Enchantress-type Pillow Forts use those tax-to-attack enchantments along with: Enchantment-heavy Pillow Fort decks try to grind out advantage by both taxing opponents who want to attack while building up their resources for the late game
Weaknesses of the Deck A weakness of the deck becomes apparent as soon as many cards have landed in the graveyard, and it becomes difficult to bring them back into play
Evra isn't the best at this since we have more mana-efficient ways to drop our life totals like Selenia, Dark Angel and Wall of Blood