Many energy cards are primarily designed to be one or the other, and exploiting the differing rates of returns between them using the efficient generators to fuel the powerful outlets is a big part of deckbuilding around this mechanic
As we said earlier, there are tons of playable cards in a Cube
If you Overkill your own creature right after casting it, you can deal up to 9998 damage to your opponent
Having access to this with cards like Sythis, Harvests Hand in the command zone means you cast an enchantment, draw a card, the enchantment enters, and you can play a land from your hand
Jumbo Cactuar Rarity: Rare TYPE: Creature SUBTYPE: Plant CMC: 7 Mana cost: USD: $10.96 EUR: 4.70 TIX: 0.02 EDHREC RANK: 3287 (1/7) 10,000 Needles Whenever this creature attacks, it gets +9999/+0 until end of turn