After testing a bunch of different builds, I eventually ended up with the Bant build we're playing today, in large part because Esika's Chariot helps solve one of Mechtitan Core's biggest problems (which is that the Voltron token it makes doesn't have any protection, so it tends to get killed or bounced a lot)
Your eyes do NOT deceive you
Zopandrel, Hunger Dominus is another good way to do the thing, as is old faithful, Craterhoof Behemoth
Popular choices include: Standard Sleeves: Perfect for most trading cards, especially for games like Magic: The Gathering and Pokmon
A character card that can weaken two of your opponents characters by 3000 Power for one turn, and having a leader with Whitebeard Pirates grants this card the Rush keyword, to attack in the same turn he is played