Iona, Shield of Emeria The problem is that this effect easily shuts a player out of the game: it totally stops monocolor players from playing Magic , and even many two-color decks often have a large portion of their hand (and their commander!) rendered uncastable by Iona
The Fallen Gods : The Wild Magic table, though altered from the traditional D&D variant
Seton, centaur druid At the risk of sounding a little preachy, I think this being said by Seton holds some weight
As very few of his cards require being cast on his own main phase, Swag is able to leave mana open to threaten a counterspell or a bounce effect during everyone elses turns
2016-04-08 If an opponent discards a card that shares two card types with the card you discarded, such as an artifact creature, that player still only loses 3 life
Of course, what a shame it would be to keep such a killer feature all to myself, so here it is for everybody to enjoy