Ten mana is a lot, which is why you can also reduce the cost of it by one mana for each untapped creature you tap as you cast it

The original 1998 Pokemon cards Classic 1999 expansion set Dark Pokemon theme set First Gold & Silver era set Rare shadowless variants First edition premium cards Modern high-value set Shiny Pokemon collection Base #1/102 Base #2/102 Base #3/102 Base #4/102 Base #5/102 Base #6/102 Base #7/102 Base #8/102 Base #9/102 Base #10/102 Base #11/102 Base #12/102 Base #13/102 Base #14/102 Base #15/102 Base #16/102 Base #17/102 Base #18/102 Base #19/102 Base #20/102 Base #21/102 Base #22/102 Base #23/102 Base #24/102 Base #25/102 Base #26/102 Base #27/102 Base #28/102 Base #29/102 Base #30/102 Base #31/102 Base #32/102 Base #33/102 Base #34/102 Base #35/102 Base #36/102 Base #37/102 Base #38/102 Base #39/102 Base #40/102 Base #41/102 Base #42/102 Base #43/102 Base #44/102 Base #45/102 Base #46/102 Base #47/102 Base #48/102 Base #49/102 Base #50/102 Base #51/102 Base #52/102 Base #53/102 Base #54/102 Base #55/102 Base #56/102 Base #57/102 Base #58/102 Base #59/102 Base #60/102 Base #61/102 Base #62/102 Base #63/102 Base #64/102 Base #65/102 Base #66/102 Base #67/102 Base #68/102 Base #69/102 Base #70/102 Base #71/102 Base #72/102 Base #73/102 Base #74/102 Base #75/102 Base #76/102 Base #77/102 Base #78/102 Base #79/102 Base #80/102 Base #81/102 Base #82/102 Base #83/102 Base #84/102 Base #85/102 Base #86/102 Base #87/102 Base #88/102 Base #89/102 Base #90/102 Base #91/102 Base #92/102 Base #93/102 Base #94/102 Base #95/102 Base #96/102 Base #97/102 Base #98/102 Base #99/102 Base #100/102 Base #101/102 Base #102/102

If they do, then as blockers are declared in the combat phase, that battle's protector chooses which, if any, creatures they control will block that attacking creature
Ok Pikachu GX & Eevee GX Special Collection (Pokemon Cosmic Eclipse) Details All prices are the current market price
In token strategies, it snowballs out of control by turning every single generator into double the army
Dragons Approach deals three damage to each opponent when you cast it, which can deal a fair amount of damage each time you cast it