This is why lands which enter tapped are written with a replacement effect instead of a triggered ability: if they came in untapped and then became tapped a moment later due to a trigger, there would still be a window where players could tap them from mana and negate this drawback
Cacophodon provides a nice crossover with the red pingers and both play well with mini-wildfire style effects that benefit from big mana, with X-spells that distribute damage (Rolling Thunder) becoming possibly very powerful with the other enrage creatures
Addendum If you cast this spell during your main phase, you may put a permanent card with mana value 7 or less from your hand onto the battlefield
This duo is the Wellwisher that wins the game instead of delaying it
Key Creatures : very light theme, but some legendary creatures have extended art
The latest card being suspended is DJ, and the design team says that DJs ability to permanently steal resources with such ease was simply not an intended use of his mechanic. They didnt want to errata the card either, but because he can have such a major impact on the playstyle of opponents trying to get rid of him quickly, it was decided to remove him from the game