Just some Concepts/mechanics I've been thinking about, finally found a place to put them! (costs are only guesses, everything's probably OP/UP)
Spell - 6
![Earth :earth](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/earth18x18.png)
- "Tremor" Your opponent's creatures are now Burrowed. Airborne Creatures are unaffected. Their unburrow cost is their casting cost.
Spell - 8
![Time :time](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/time18x18.png)
- "Stopwatch" Your opponent's creatures are delayed 1 turn. All Remaining Time Quanta is consumed.
Creature - 6
![Water :water](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/water18x18.png)
- "Hydra" 3/3 Adrenaline (to simulate multiple heads attacking)
Perm - 10
![Gravity :gravity](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/gravity18x18.png)
- "Gravity Well" Damage you would take is redistributed among your creatures. If you control no creatures, Gravity Well is destroyed. Maintence of 5
![Gravity :gravity](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/gravity18x18.png)
per turn.
Creature - 7
![Darkness :darkness](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/darkness18x18.png)
- "Doom Bringer" 0/1 Immortal. 4
![Darkness :darkness](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/darkness18x18.png)
"Death Touch" Target creature has 10% chance of dying. Whenever Doom Bringer kills a creature, it gets +2/0.
I've got more thoughts, but feedback on these would be appreciated!