Certainly Courser isn't trading in that situation but it might well be allowing a Shock to take him down or even a combat trick
Vampiric Tutor [Instant-Speed Tutor at One Mana] Vampiric Tutor is what efficiency looks like in black spells in MTG
Two weird reprints in this deck are Colossal Whale and Hornet Queen
Im Nick from the Scrap Trawlers, where we do EDH on a budget, and I previously reviewed the Grave Danger from the Starter Commander deck series
There are a few cards in these lists that are on my list of potential bans, such as Smugglers Copter and Treasure Cruise, but the majority of these cards (and decks) are safe
Eldrazi typal strategies love this, as does anything that uses a lot of morph or disguise effects, as those are colorless creatures on the stack, too