She's a staple on a whole other level from Svyelun
For seven mana you get an on curve 7/7 with four powerful keywords - flying (evasion), vigilance (very strong in multiplayer swinging at people in the air for Commander Damage and then holding the fort), deathtouch (no one wants to block) lifelink (nice double life swing for that 7 damage.)
Remember, your hand is going to consist of seven cards at the start of the game, and if your plan is to spend one of those ramping to get to a four-mana turn three, then you really want to be spending all that mana every turn to get the most value out of that card
Activate "Goblin" to destroy itself and send "Mementoal Tecuhtlica - Combined Creation" and "Dark Blade" from the Deck to the GY
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Playing multiple cards allows you to peek at your next draw, Exile it, and play it at your discretion