You cannot Special Summon the turn you activate this effect, except DARK Machine monsters
Its awesome that if you play this and have nothing to discard, you still get to draw the two cards
Note that the wincons also can serve as creature removal, which is why so many of the outs are instant/sorcery removals In: Haven of the Spirit Dragon (creature recursion), 3 Mountain (31 lands is not enough - will miss land drops too often and its vital that the commander come down ASAP - nick loses too many times by not getting threats out in time) In: Cinderclasm (better than blazing volley), Shenanigans (reusable artifact destruction, combos with Liquimetal Torgue), Chaos Warp, Mizzium Mortars (one sided boardwipe) In: Gadrak, the Crown-Scourge, Taurean Mauler, Dragonkin Berserker, Dragonmaster Outcast, Molten Echoes, Minion of the Mighty, Sunbird's Invocation
As mentioned before, I would stick with investing in vintage Magic Golden and Bronze era booster boxes BUT I would not say NEVER to buying the newer sets