card sleeves 1000 Mlikero Count Sleeves, Baseball Card for Standard Cards, 10 Colors Trading Cards Sleeves Fit for MTG, Football Card, Sports Cards, Game Cards : Toys & Games and surface wear Semi Rigid Card Holder (1000

The source of the copy from Mister Fantastic's last ability is the same as the source of the original ability

087 Dawn

Skittish Valesk Rarity: Uncommon TYPE: Creature SUBTYPE: Beast CMC: 7 Mana cost: USD: $0.19 EUR: 0.16 TIX: 0.04 EDHREC RANK: 27123 (5/5) At the beginning of your upkeep, flip a coin

It's often used at the end of opponents' draw steps to foil their turns, and it's a heinous partner with card draw deniers like Narset, Parter of Veils

Even more important is that when cast during your first main phase, the card gives you an additional combat phase and untaps all of your creatures when attacking, acting as a form of vigilance but ensuring you can get two full swings in across your two combat phases