I think that it can be an interesting thing to make an magic arrows for each element oand few other cards so:
These cards has "splash ability" they works on 3x3 radius for 1 turn, so:
unupgraded cost -4 upgraded cost -3
Entropy arrow - -1 HP invert attack power for 1 turn
Death arrow - give +2 to poison
Gravity arrow - -1 HP gravity pull for 1 turn
Earth arrow - -1 HP +1 to maximum life points for each 3 HP of target creatures
Life arrow - U gain 1 life for 3 HP of target creature -1HP
Fire arrow - Creatures lose 1 HP per turn
Water arrow - Creatures are frozen for 1 turn and -1 HP
Light arrow - Creatures lost 1 HP U gain 1
qunta for each 3HP od target creatures
Air arrow - Creatures lost 1 HP and airborn skill
Time arrow - Creatures lost 1 HP and stay in time bubble for 1 turn
Darkness arrow - creatures lost 1 HP miss 1 attack
Aether arrow - Creatures lost 1 HP and skills for 1 turn
Cost -1 when U use:
-Eagle eye or upgraded bersion of card
-short bow or upgraded bersion of card
and for "others" cards- quiver (10/7) random quanta (it has 3 arrows inside)
card is "free" U use quanta to unpack quiver
I`m waiting for your opinions, changes and ideas