Tajic, Legion's Edge is a rare Legendary Creature — Human Soldier card from Guilds of Ravnica Promos (PGRN), collector number 204p. Current market price: $0.79 (foil $1.60), TCGplayer market prices via Scryfall.
Haste Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.) Prevent all noncombat damage that would be dealt to other creatures you control. {R}{W}: Tajic gains first strike until end of turn.