pokemon card sleeves White Flare 65 ct Size is approx Pokemon Center Japan - Mega

Effect Monster EARTH Doki Doki You can discard 1 Rock monster

There are also a lot more lands that can fit into a mono-color identity than I expected

Dynamite Dark Contract with the Eternal Darkness Destruction of Destiny Dimensional Barrier Discord Dogmatika Punishment Extinction on Schedule Forbidden Apocrypha Gozen Match Grave of the Super Ancient Organism Grisaille Prison Kozakys Self-Destruct Button Lose 1 Turn Macro Cosmos Mischief of the Gnomes Ojama Duo Ojama Trio Phantasm Spiral Battle Pinpoint Dash Relay Soul Ring of Destruction Rivalry of Warlords Secret Barrel Secret Blast Skill Drain Spright Double Cross Stygian Dirge Summon Limit Tearlaments Cryme Tearlaments Metanoise Tearlaments Sulliek The Monarchs Erupt There Can Be Only One Warning Point Welcome Labrynth Limited: Crimson Nova the Dark Cubic Lord Flower Cardian Willow Machina Citadel Swordsoul of Mo Ye Therion King Regulus Trickstar Candina Trickstar Lycoris Virtual World Mai-Hime Lulu Wisdom-Eye Magician Witchcrafter Schmietta Black-Winged Assault Dragon Black Feather Whirlwind Black Whirlwind Lair of Darkness Necrovalley Spell Power Mastery Speedroid Scratch Speedroid Wheel

And, obviously, you may only use the resources of only that player to pay the costs, not your own

It rewards very aggressive plays by giving you more Soldier tokens when you take damage, so keeping yourself open to attacks or choosing not to block is often a vital part of securing your victory