Stealing an artifact is always a good option if they have a good one, and the draw two, discard two mode rips through your deck and finds what you need
Blessed Alliance has a hidden, often unused mode, that has become startlingly relevent: If target player is at nine or more life, kill all creatures named Deaths Shadow controlled by that player. Thats right, Blessed Alliance does not just read Gain 4 life but rather has target player gain the life
In the world of Magic: The Gathering, four-color cards are somewhat hard to come by they're particularly difficult to make distinct from mono-color cards without causing clutter, so they're produced in much fewer numbers than even three or two-color cards
Both cards allow you to exile a card that you may play
Propaganda and Ghostly Prison make it harder to attack you as it also requires mana payment to do so for each attacking creature