Is Heartwood colorless?
No. Heartwood tokens are red and green, even when an early printing uses a colorless-looking frame. The artifact taps for red or green mana and is not sacrificed to pay for that ability.
When an effect asks about colors, do not decide by looking only at the frame. Keep Heartwood distinct from a Treasure token: using the same marker for both makes it easy to forget whether the resource stays on the battlefield. The mechanics guide covers its role as a mana source.
Why is there no matching Angel in my Commander deck?
The official token article says the 4/4 white Angel token made by Ob Nixilis, the Ascended is available in Collector Boosters and later printings of Multiverse Reforged. Its absence from an early printing therefore does not, by itself, establish that a gameplay card is missing.
Compare the actual deck cards with the official Commander list. Keep the token question separate when contacting your store about a product discrepancy. At an event, ask the organizer about an appropriate clear substitute for a token you do not have.
Art cards are a separate collection
The official article lists 54 art cards and shows the token and emblem designs alongside their product availability. An art card is not a gameplay printing of the depicted card.
The collection checklist here tracks named FRA gameplay cards. It does not track art cards, tokens, emblems, stamped variants or each foil finish. Keep those in a separate inventory and use the official token and art-card gallery when matching a design.