Guardian Scalelord is a rare Creature — Dragon card from March of the Machine Commander (MOC), collector number 103. Current market price: $3.72, TCGplayer market prices via Scryfall.
Backup 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following abilities until end of turn.) Flying Whenever this creature attacks, return target nonland permanent card with mana value X or less from your graveyard to the battlefield, where X is this creature's power.