The lands entering tapped trigger is a weird riff on ones like the fastlands (ala Darkslick Shores) - tapping for colorless is a very good ability on lands like these, since it makes it so that the caster can use the land without having to dome themselves repeatedly
0093_MTGMB2_WhiteRep: Uro, Titan of Nature's Wrath 0115_MTGMB2_WhiteRep: Wasteland 0058_MTGMB2_WhiteRep: Goblin Guide The change in border does not alter the legality of these cards, and they are legal for play wherever their black-bordered counterparts are
Gaeas Cradle is the green version of Tolarian Academy, but instead cares about creatures
BPhillipYork: Pretty solid, slam out to get some energy and then pump your weenies later and also get a cheap block off
These feature an atomic model-esque mana symbol (note: not an actual atomic model for mana) over a vibrant planetary-scale landscape: Both the orbital space-ic and planetary space-ic basic lands can be found in Draft and Collector Boosters, in both foil and non-foil treatments
You may not choose one of the Spider permanents to keep and you may not put any of the Spiders into your graveyard this way