The second ability represented by the "partner with [name]" keyword modifies the rules for deck construction in the Commander variant and has no function outside of that variant
Judges have a long and storied history of trying (sometimes in vain) to explain split cards to players
The mana could also go towards land destruction spells such as Acidic Slime, Reap and Sow, and Woodfall Primus, to prevent control decks from stopping Thrun with Iona, Shield of Emeria
Now you have an opportunity to show her that they really could have been worth a lot of money one day
There is an incredible breadth of different possible strategies, each with remarkable depth to them
If Goldbug, Humanity's Ally dies before combat damage is dealt to attacking Humans, the damage won't be prevented