If you must relegate Abaddon to the 99 of a deck (and let's be honest here who could relegate Abaddon the Despoiler of all the beings existing in Warhammer 40,000 to the 99?!), we think the only real choice is Yidris, Maelstrom Wielder
There are loads of ways to do so, but perhaps the best way is through counterspells
Fetchlands and shocklands can also notably damage your life total to grow your Death's Shadow
Furthermore, instead of sending the foe to the discard pile, they get sent to the Lost Zone along with all of their attached cards
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