Doing all the work of getting songs into your discard to make him cheap enough to play only to have him immediately and efficiently dealt with is pretty backbreaking
One of these dalmatian puppy cards is Lucky, The 15th Puppy, one of the few named dalmatian puppy cards found in Into the Inklands
Commander staple or not, it's not exactly coveted despite its pedigree as one of the better budget counterspells in EDH
This mechanic is central to the game's pacing: the game rewards setting up characters safely and punishes over-committing into a board your opponent can immediately challenge
For example, if you attack with a 5/5 creature with trample and it's blocked by a 2/2 creature, you can assign 2 damage to the blocker and 3 damage to the defending player
Limited availability adds value to exclusive promo cards like Ursula, Mickey, and Maleficent