In summary: Whatever the source (rule or explicit), Breeding Pool needs 2 mana abilities because other cards can take away one basic land type (and thus mana ability) while leaving the other intact - 305.6 simplifies the templating necessary to add and especially take away mana abilities based on the basic land types a land gains or loses
Despite its complexity, regeneration maintained its popularity for many years
Summary The Modern format offers diverse deck options with powerful cards, making it stable and constantly evolving
do I stay with Sun & Moon until I have all the mechanics figured out, or branch off into some older series
The colors are solid enough that you can't see the card through the back of the sleeve, which is a good thing
owyn, Fearless Knight owyn, Fearless Knight is a solid commander that can effectively clear the board of bigger creatures