Historic is a format with an abundance of ramp cards such as Growth Spiral, Explore, Uro, and much more, so getting six mana into play quickly is a strong possibility
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The Mega Rising expansion in TCG Pocket takes a cue from the Mega Evolution sets released in the physical TCG (Mega Symphonia and Mega Brave), and introduces a couple of new rules that are a little different from what we have been aware of in Pocket battles till now
For example, Sunblade Samurai can be channeled at any time, but only cast during your main phases
Whenever this creature attacks, you may return another creature you control to its owner's hand
There are no longer any cards to get around this as they have all been rotated out (Broken Time Space and Spiritomb AR) or errata'd (Rare Candy)