It's a secret rare Pokmon card, and the only way to acquire it is by collecting cards you plan to try to collect anyway, so there is no loss of effort for a collector
While most services can get your cards back in 2030 days, it may take up to 2 months for your cards to get sent back from the grading company
Once Stony Silence comes down, if you have no way of removing it (you often wont), make sure to sacrifice all of your artifacts that will be useless to Arcbound Ravager and perhaps even sacrifice the Ravager to itself to modular onto an evasive creature
If you're looking for a copy to own and aren't worried about it being in the best condition, you can find MP cards for about $20
I even devoted a column to the topic and I'll invite you to give it a read here
The drawing ability and +3/+3 should be valued at about five mana in blue (compared to Drake Umbra or Illusionary Armor), so the extra mana for a body that sticks around makes this card a great value