Line : Meaning a line of play or "play line." For example, at 9 Don
If you are relying on less well protected threats or more contained threats you want to keep in play like Sheoldred and Elesh Norn then Spellskite is a fantastic card for the job
A dot on the bottom/top/corners will knock it down to a 9 automatically as a gem int 10 must have no whitening but there are rare cases where tiny spots of whitening on the left/right of the edge have hit a 10 since the slab can kind of hide this flaw
Its 2-mana costs are perfect for you to start with the adventure and then cast it the following turn, and having double strike makes all your equipment and auras attached to it doubly effective at increasing his power

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

Shining Mewtwo