Ekko

Spending the charge turns a six-Energy, one-Power unit into a four-Energy play with no Power. The Power part needs Power in the cost you pay, and Power paid for Accelerate counts. Ingenious costs no Power, so the charge drops him only from three Energy to one and still gives him the kill text, which usually makes him a poor target. The effect goes to the next unit you play this turn, even one replayed by Revolutionary's Action or another effect. A replay that ignores its cost gains nothing from the discount but still takes the kill text, so activate the Legend immediately before the unit you mean to discount.

Ingenious's additional cost returns a friendly unit to its owner's hand. If that unit carries the Legend's kill text, the trip to hand clears it and the unit's other temporary changes. Discount a six-Energy, one-Power unit to four Energy, then play Ingenious for three: seven Energy buys its play effect, a 4-Might Ganking unit and the card back in hand. Ingenious cannot be played while you control no other unit, because the return is a required cost. Returning the unit means paying its full cost again, so save this line for a unit whose play effect you want twice.

Chronobreak costs two Energy plus any amount of Power, banishing one unit you control for each Power, then replaying each to the same location or its owner's base, ignoring its cost. The replayed units are new objects, so they lose damage, buffs, statuses and the kill text, and their play effects trigger again. They enter exhausted unless they say otherwise: paying two Energy and two Power for a doomed unit and Revolutionary replays both, but only Revolutionary comes back ready. Chronobreak has neither Action nor Reaction, so cast it in your open Main Phase after the units have done their work, not during a Showdown.