Here are some of my cards that I find to have interesting capacities: Lunar Eclipse - 1UB Enchantment Whenever a player discards a card, each of that player's opponents may draw a card. Imperial Court Land T: Add 1 to your mana pool. U: Add [W] or to your mana pool. Daedalan Vaults Legendary Land - Ruins ~This~ does not untap during your untap step. Tap an untapped non-basic land you control: Add one mana of any color to your mana pool. Dark Thoughts - 3UB Instant Reveal the top card of your library. You may pay 1 life; if you do, put the card into your hand, otherwise put it in your graveyard. Repeat this process seven times. *This one might be too powerful. Perhaps only 6 times? Or 5?* Canopy Drake - 2G Creature - Drake - 2/3 Flying. 1R: ~This~ deals one damage to target creature. Deathspeaker - 2B Creature - Human Cleric Politician - 2/2 Pay 2 life: Each opponent loses 1 life. Saddist Elite - 1BB Creature - Wraith Templar - 4/1 Whenever ~this~ becomes blocked, each creature blocking it gets -4/-4 until end of turn. Saddist Crippler - XBB Creature - Human Cleric - 2/2 When ~this~ comes into play, target creature gets -X/-X until end of turn. Cripple - 1B Instant Target creature gets -3/-3 until end of turn. Sun Djinn - 3WW Creature - Djinn - 6/6 First Strike; ~This~ deals no combat damage to creatures with power less than 2. Ice Elemental - 3UU Creature - Elemental - 4/4 During your upkeep, tap target permanent. That permanent doesn't untap during it's controller's next untap step. Lurin's Protectorate - G Creature - Dryad Ranger - 3/3 Foresthome; Whenever a creature attacks you, it loses flying until end of turn. Saddist Corrupter - BB Creature - Human Cleric - 0/1 Stoic; Whenever ~this~ attacks, defending player loses 3 life. Channel Druid - 3GG Creature - Human Druid - 3/3 When ~this~ comes into play, put a channel counter onto it for each creature you control. Remove a channel counter from ~this~: Spells you play this turn cost  or [G] less to play. Volcanic Upwelling - RRR Sorcery Choose one - destroy target land or ~this~ deals 3 damage to target creature or player. Numinati Elder - GG Creature - Human Druid - 2/2 T: Counter target activated ability. Sacrifice ~this~: Counter target activated ability. Crusader of Reason - 1W Creature - Human Templar - 2/2 Protection from Blue. Just some of the cards I've been tweaking, tell me what you think.