Esper Sentinel Card draw on a human Esper Sentinel is a one-mana White 1/1 that reads: Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays X, where X is Esper Sentinels power. On the face of things, that means you get to draw a card unless your opponent pays one mana
Set:Dark Phantasma

Rarity: R Cost: 1BB Card Type: Enchantment Artist: Vincent Proce Name: Phyrexian Arena Finish: Foil Card Number: 004/008 Set Name: Commander Collection: Black Related Products Phyrexian Arena - Foil Phyrexia: All Will Be One Light Play, English 2 In Stock Light Play, English 2 In Stock Light Play, English 2 In Stock Reanimate - Foil Commander Collection: Black Light Play, English 2 In Stock Light Play, English 2 In Stock Light Play, English 2 In Stock Command Tower - Foil Commander Collection: Black Light Play, English 2 In Stock Light Play, English 2 In Stock Light Play, English 2 In Stock Toxic Deluge Commander Collection: Black Light Play, English 4 In Stock Light Play, English 4 In Stock Light Play, English 4 In Stock Reanimate Commander Collection: Black Light Play, English 5 In Stock Light Play, English 5 In Stock Light Play, English 5 In Stock Command Tower Commander Collection: Black Light Play, English 4 In Stock Light Play, English 4 In Stock Light Play, English 4 In Stock Liliana, Heretical Healer // Liliana, Defiant Necromancer - Foil Commander Collection: Black Light Play, English 1 In Stock Light Play, English 1 In Stock Light Play, English 1 In Stock Ophiomancer - Foil Commander Collection: Black Light Play, English 1 In Stock Light Play, English 1 In Stock Light Play, English 1 In Stock

Sources: TCGPlayer / Giratina, Ptcgradio / YouTube, TCGPlayer / Charizard, TCGPlayer / Aerodactyl, TCGPlayer / Umbreon, TCGPlayer / Rayquaza, TCGPlayer / Pikachu
Even late game, Undo could take out two key blockers allowing for your creatures to swing in for that last few damage
You can use it to move two energy from a benched Pokmon to an active one