stainless steel yugioh card Fanattik YU-GI-Oh! - Black Luster Soldier New TCG Announcement: Stainless Steel

Heart of Kiran: Minus the clause, this is a five mana 4/4 that you pay for every turn

The practical consideration for competitive use is sleeving

Even if each opponent only casts one spell in a turn cycle, the Mauler will become a 5/5 for three mana after one turn, which is great value, especially when you have Typal payoffs

[2] Once per turn, during Damage Calculaton involving this card: You can make this card gain ATK equal to your LP

Think about type changing cards like Blind Seer, Scuttlemutt, Trait Doctoring, and Mind Bend for color, and Mystic Compass, Tideshaper Mystic, and Vision Charm for lands

If you have at least four Humans (including Rick itself) all of them get a stat boost of +2/+2 which when you have a giant battlefield of Humans gets out of control very quickly