Well, since we're going for favorites...what's your favorite wall? Illusionary Wall, a 7/4 flying wall with a CU of U? Wall of Swords, the original 3/5 flying for 3W? Wall of Stone, the big-butted 0/8 for 1RR? Fog Bank, the flying blocking beast for 1U? Stinging Barrier, the wall that hits back for 2UU? Wall of Souls, the OTHER wall that hits back for 1B? Wall of Blossoms, card advantage a-go-go for 1G? Vine Trellis, AKA Wall of Elf for 1G? Let 'em fly!