The universal dilemma of the Infiltrator was that few decks that played it wanted to tap out to get him there, but sticking him on the board was so devastating that most opponents would consider themselves fortunate to spend that window of opportunity making him go away as trying to race him with a traditional three- or four-drop was pure folly and playing your own blocker, including your own Shadowmage or something a little bulkier risked a removal spell that would lead into a downward spiral of card disadvantage
Among modern MTG black cards, few combine removal and long-term inevitability this cleanly
The point of Chaos draft is to have fun, not necessarily to crush all your opponents underfoot by knowing you'll open a specific near-unbeatable card
Thirsting Axe: The downside is really restrictive and I am not sure it is worth it, unless you meant to sacrific the creature anyway.
Selenia Much like Crovax, the Phyrexian angel Selenia deserves some far better treatment
If you choose not to cast the card, it remains in exile
