For example, say Obeka deals combat damage and its ability resolves during your combat damage step, giving you two additional beginning phases each containing an upkeep step after this combat phase
On top of that, it reads: At the beginning of your next main phase, add an amount of colourless mana equal to that spells mana value." Basically, not only do you get to say no to something, you also get to cast something bigger on your next turn
However, it gets even more potent if Charizard EX has damage counters it can deal an additional 100 damage, reaching a total of 160 damage with just one energy required
Phyrexian Tower hides your Sac outlet on an MTG land, avoiding a lot of pesky removal
At the beginning of your upkeep, when Mechanized Production triggers, cast Officious Interrogation for as many targets as necessary to create at least 8 total clue tokens
Graded Population Report: Greninja ex #214 Visualize the distrbution of grades in the chart