Goblin Matron Can't find the goblin you require
If multiple removal-heavy decks like Jund, Mardu Pyromancer, and Jeskai Control find homes in this brave new Modern world, I could see this cards stock going up considerably
Dwynen's Elite Rarity: Common TYPE: Creature SUBTYPE: Elf Warrior CMC: 2 Mana cost: USD: $0.21 EUR: 0.13 TIX: 0.03 EDHREC RANK: 5895 (2/2) When this creature enters, if you control another Elf, create a 1/1 green Elf Warrior creature token
This means that even if a player has established incredible defenses, Sower of Discord can allow that player to be dealt damage by simply attacking another opponent
In theory, it is possible to cast Cruel Ultimatum and lose the game, but I have not seen this happen
And as a primarily Boros mage, I have to lean towards Swat