You must follow all normal timing rules for a card you play using Charforger's last ability and, if it's a spell, you must pay its costs to cast it
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You see the gold symbol on Anthem of Champions on the right between the art and text box, and in the lower left, FDN stands for Foundations
It allows an artifact, sorcery, instant, or enchantment to have creature types like Eldrazi, giant, or elemental as part of its type line, which means that card can trigger abilities that trigger when you cast certain creature types or when certain creature types enter
The downside is your opponents probably know this too and if they succeed in shutting down Vadrik you won't get anything done
I also take solace in the sheer beauty of the cards