At the beginning of your upkeep, reveal the top card of your library and put that card into your hand
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The rarity table for Base Set 2 is give below: image881763 16.9 KB The uncommons sheet (including the obscured cards) is as follows: Dodrio, Butterfree, Machoke, Defender, Arcanine, Dratini, Exeggutor, Dewgong, Energy Retrieval, Haunter, Farfetchd, Ivysaur, Marowak, Full Heal, Fearow, Kakuna, Magikarp, Maintenance, Charmeleon, Lickitung, Nidorina, Rhydon, PlusPower, Growlithe, Persian, Nidorino, Poliwhirl, Pokmon Center, Growlithe, Raticate, Parasect, Machoke, Pokdex, Pokmon Center, Tauros, Weepinbell, Seaking, Professor Oak, Jynx, Double Colorless Energy, Butterfree, Marowak, Super Potion, Magikarp, Magmar, Haunter, Exeggutor, Dodrio, Seel, Defender, Arcanine, Seaking, Kadabra, Weepinbell, Energy Retrieval, Jynx, Dewgong, Farfetchd, Ivysaur, Rhydon, Full Heal, Haunter, Fearow, Kakuna, Wartortle, Maintenance, Charmeleon, Lickitung, Nidorina, Machoke, PlusPower, Magikarp, Persian, Nidorino, Dewgong, Pokmon Center, Growlithe, Raticate, Parasect, Poliwhirl, Double Colorless Energy, Marowak, Tauros, Weepinbell, Charmeleon, Pokdex, Magmar, Double Colorless Energy, Seel, Professor Oak, Arcanine, Dratini, Butterfree, Super Potion, Rhydon, Defender, Farfetchd, Parasect, Poliwhirl, Kadabra, Fearow, Exeggutor, Seaking, Energy Retrieval, Lickitung, Ivysaur, Full Heal, Professor Oak, Dratini, Kakuna, Super Potion, Wartortle, Maintenance, Raticate, Nidorina, Seel, PlusPower, Persian, Nidorino, Wartortle, Kadabra The commons sheet has the card sequence shown below

A 13/13 Lizard Horror with trample is likely large enough of a creature to end most games in a couple of swings, even if you happen to be playing Commander