Stack Strength, then swing multi-hit attacks. Simple, and it wins.
Data from build 23811903, updated

The Ironclad
The last soldier of the Ironclads. Crushes foes with sword and flame against his will.
Grab every Strength source you can find and spend it on cards that hit more than once. Demon Form and Inflame do the stacking, Whirlwind and Twin Strike turn each point into several. Ruined Helmet doubles your first gain each fight, so make that one Inflame or Fight Me.
Ruined HelmetRareDoubles your first Strength gain each combat, so an opening Inflame gives 4. Vajra triggers first and spends it on 1.
VajraCommon1 Strength at the start of every fight. With Ruined Helmet it takes the doubling and starts you at 2.
BrimstoneShop2 Strength every turn, but ALL enemies gain 1. Great in fights you end fast, risky in long ones.
3Demon FormRare PowerAt the start of your turn, gain 2 Strength.2 Strength every turn from a 3-Energy power. Play it once you have Block up, because it eats your whole turn on 3 Energy.
1InflameUncommon PowerGain 2 Strength.2 Strength for 1 Energy. Take every copy you see.
XWhirlwindUncommon AttackDeal 5 damage to ALL enemies X times.5 damage to ALL enemies once per Energy spent, and Strength adds to every hit. Your finisher and your answer to multi-enemy fights.
1Twin StrikeCommon AttackDeal 5 damage twice.5 damage twice, so Strength counts double. The cheap multi-hit that makes Inflame worth it early.Take these on sight. The build doesn't work without them.
Strong once the core is in. Take them over anything below.
Fine until something better shows up. First to go when a shop offers removal.
Does little in this deck. Skip the reward and keep the deck thin.
Drafting without a plan? The card tier list ranks every card for its own character, and those picks hold up in any deck.
Open the card tier list