+taunting (6)
Whenever you cast a spell during an opponent's turn, you may have each opponent lose 1 life.
Kicker (You may pay an additional as you cast this spell.)
When Taunting Arbormage enters the battlefield, if it was kicked, all creatures able to block target creature this turn do so.
All creatures able to block target creature this turn do so.
All creatures able to block Taunting Elf do so.
Haste
Whenever Taunting Kobold attacks, goad target creature an opponent controls. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)
Sliver creatures you control have "When this creature enters the battlefield, goad target creature an opponent controls." (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)
Gatherer works better in the Companion app!
(You may pay an additional as you cast this spell.)