Roiling Vortex

At the beginning of each player's upkeep, Roiling Vortex deals 1 damage to them.
Whenever a player casts a spell, if no mana was spent to cast that spell, Roiling Vortex deals 5 damage to that player.
{R}: Your opponents can't gain life this turn.

Lightning Helix

Lightning Helix deals 3 damage to any target and you gain 3 life.

Font of Ire

{3}{R}, Sacrifice Font of Ire: It deals 5 damage to target player or planeswalker.

High Noon

Each player can't cast more than one spell each turn.
{4}{R}, Sacrifice High Noon: It deals 5 damage to any target.

Molten Vortex

{R}, Discard a land card: Molten Vortex deals 2 damage to any target.