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Were getting into the territory of cards worse than Squire or Omega Myr

Players can respond to their opponents abilities with their own instant effects

This rule was clearly added to prevent players from gaining too much advantage in having more resources in hand than the other players, and so this rule can often be seen as a downside since you are losing cards due to a simple yet sometimes unavoidable rule

There are certainly cards in Vintage that are better at generating card advantage (Ancestral Recall, Treasure Cruise, Dig Through Time), but you can only play one of each of those

Regal Behemoth is a great six-mana cost Dinosaur with 5/5 stats and Trample