river song mtg card Song's Diary Universes Beyond: Doctor Who Collectors | Magic then you may exile a nonland card from your hand with a number of time counters on it equal to its mana value River Song | Doctor Who

You can easily offset its drawbacks and if nothing else, I would always play this over Progenitus

If your opponent has just 1 champion in play, they can block your first attacking demon and then only take 4 from the second half of your gold (the second demon)

Drizzt DoUrden Summon Legend First strike

While I missed out on dealing my opponent 4 damage because I waited too long to give my creature flying, the good news is that I will successfully kill their creature in combat thanks to the +2/+2 bonus to Alabaster Host Sanctifiers power and toughness, even factoring in Redcap Heelslasher hitting my creature first with First Strike