A more true comparison might be to Mana Geyser
Changes in the number of unlocked doors among Rooms you control that occur after the ability resolves won't affect the power or toughness of the token
The doctor gives itself unblockable, attacks, and suspends a card from your hand
(It's an artifact with ", Sacrifice this token: Add one mana of any color.") Gadrak can't attack unless you control four or more artifacts
And you can't leave without the mention of Spider-Ham, Peter Porker which lists rabbits among 18 animal creature types in it's boost
If you aren't familiar with Magic (which is entirely reasonable given that we cover multiple card games on the site and there will be readers that don't particular about some of the games we cover), then the big deal with this card is the fact for 10 years, the ability simply couldn't be utilized under any circumstance at all