Karn, Scion of Urza [Dominaria Promos] IDW Comics 2014 it gets +5/+5 and gains

it gets +5/+5 and gains trample until end of turn

−8: Target player gets an emblem with "Whenever you cast an instant or sorcery spell

if you control twenty or more creatures

Phyrexian Marauder can't attack unless you pay {1} for each +1/+1 counter on it

Karn, Scion of Urza [Dominaria Promos] IDW Comics 2014 it gets +5/+5 and gainsSet: Dominaria Promos Type: Legendary Planeswalker Karn Mythic Cost: {4} +1: Reveal the top two cards of your library. An opponent chooses one of them. Put that card into your hand and exile the other with a silver counter on it. 1: Put a card you own with a silver counter on it from exile into your hand. 2: Create a 0 0 colorless Construct artifact creature token with "This creature gets +1 +1 for each artifact you control."