Playing cards come in all shapes and sizes

DotP 2009 Xbox 360 Garruk Wildspeaker ( Duels of the Planeswalkers ) (foil alternate art) PC Nissa Revane ( Duels of the Planeswalkers ) (foil) [80] PlayStation 3 Liliana Vess ( Duels of the Planeswalkers ) (foil alternate art) DotP 2012 PC Frost Titan ( Duels of the Planeswalkers ) (foil alternate art) [81] Xbox 360 Grave Titan ( Duels of the Planeswalkers ) (foil alternate art) PlayStation 3 Inferno Titan ( Duels of the Planeswalkers ) (foil alternate art) DotP 2013 PC, iPad Serra Avatar ( Duels of the Planeswalkers ) PlayStation 3 Vampire Nocturnus ( Duels of the Planeswalkers ) Xbox 360 Primordial Hydra ( Duels of the Planeswalkers ) DotP 2014 PC, iPad, Android Scavenging Ooze ( Duels of the Planeswalkers ) (foil) PlayStation 3 Ogre Battledriver ( Duels of the Planeswalkers ) (foil) Xbox 360 Bonescythe Sliver ( Duels of the Planeswalkers ) (foil) DotP 2015 Xbox 360, Xbox One - Soul of Ravnica ( Duels of the Planeswalkers ) (foil) PC, iPad, Android - Soul of Zendikar ( Duels of the Planeswalkers ) (foil) Gift Box promos[] Resale promos[] Included in special blister packs that include three random Magic booster packs plus the foil promo

Unlike with Reserved List cards, where even bad ones can be worth quite a bit of money simply by being rare, I would not recommend buying original set foils that dont already have a lot of demand associated with them
Aggro largely applies to any deck where if given the decision between including a card focused on exchanging resources or focused on profitably attacking or dealing damage, you choose the later
The classic Howling Mine trick is to manipulate the tapping to adjust who gets to draw, but that seems less relevant than it used to be
It turns a dead card in your hand into ramp, and also plays into graveyard and self-discard strategies