Gigantosaurus

The five green pips are the entire pitch and the entire problem. A 10/10 for five mana with no evasion, no trample, no protection, and no ability beyond its raw size is the platonic vanilla beater, but the cost printed across that body is the most punishing color requirement a single card can carry short of going to six. You cannot cheat it with two Forests and a Llanowar Elves; you need five green sources of mana available at once, which collapses the card into mono-green or something close to it. That constraint is the whole design: it trades the flexibility of generic costs for a stat line that almost nothing else touches at the price, and it dares your manabase to keep up. The vanilla text is not laziness, either. A card this large with no abilities is deliberately legible: it blocks, it attacks, it dies to removal like anything else, and the only question it asks is whether your deck can produce the green to deploy it on curve. Where ramp and color discipline meet, it is a clean, brutal payoff; everywhere else it is a brick in your opening hand. Few creatures state their deckbuilding terms this bluntly.