By purchasing Galaxy, you'll receive

Galaxy Rank Prefix
Access to /nick
Access to /rtp (random teleport)
2000 Claim Blocks
5 Sethomes (Unless your vote rank has more, does not stack)

Items

3x Your Own Player Head
64x XP Bottles
5x Energy Potion (5:00 Speed 3, Jump Boost 4, Haste 2, Instant Health 2)
1x Cow Egg
Winter Hat (Unique Blue Leather Cap, Unbreaking 5, Fire Prot 3)

Heads

Galaxy
Galaxy Slime
Calico Cat Plushie
Fish Bowl