I like the concept but i feel it's overpowered.
This card alone will let you play, without off-element pillars or mark (i'll list only 3/4 quanta cards, as they are the most powerful):
: Phase Spider|Phase Recluse, Quintessence, Upped Mindgate, Silence, Lobotomizer|Electrocutor
: Wyrm|Elite Wyrm, Wings, Thunderstorm|Lightning storm, Firefly|Elite Firefly
: Steal, Eclipse, Liquid Shadow, Cloak
: Flesh Spider|Flesh Recluse, Vulture|Condor, Skull Shield, Boneyard, Plague,
Mummy! : Hematite Golem|Steel Golem, Titanium Shield,
Graboids!!!, Earthquake, Pulverizer!
: Fallen Elf, Upped Butterfly Effect, Pandemonium, Discord
: Fire Spectre, Fire Buckler, Rage Potion|Rage Elixir, Fahrenheit
: Graviton Mercenary, Upped Gravity Shield, Otyugh,
Black Hole!!!! OMG FOR FREE!!!, Catapult, Acceleration|Overdrive
: Cockatrice, Feral Bond, Adrenaline|Epinephrine, Forest Scorpion, Upped Mitosis
: Pegasus|Elite Pegasus, Guardian Angel, Blessing, Sanctuary
: Fate Egg, Turtle Shield, Golden Hourglass|Electrum Hourglass, Dune Scorpion
: Blue Crawler|Abyss Crawler, Ulitharid, Flooding, Unupped Steam Machine, Arctic Squid|Arctic Octopus, Trident|Poseidon
So i think that you should rise costs to 4
|3
OR lower the cost of the card that you can play to 2 (maybe 3, but i need to make another list to be sure!).
EDIT: I'd like to point out that you can play Mummys for free and then Reverse Time on them without using
, and also you can play Graboids for free without
and then evolve them.
Other cards that i feel "bad" are Steal, Pulverizer, Hourglasses, and Black Holes.