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This lets you play whatever extra color(s) you want, though is best paired with Silas Renn, Seeker Adept which also supports artifacts while gaining Vehicle support colors

If this creature has a +1/+1 counter on it, add three mana of that type instead.: Adapt 3

2025-10-02 Training Grounds won't affect the part of an activation cost represented by colored mana symbols or snow mana symbols

In the second chapter, The Argent Etchings gives all your creatures +1/+1 and double strike, giving you at least 15 power on board across your Incubator tokens, and since they gain double strike that's 30 damage you can send your opponents way